FAQs

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Bathroom

Are there products other than McKanica® to use in removing silicone?

There are several brands on the market. We have tested a few of them, and the McKanica® formula stood out as the best to remove a variety of silicone residues from the surface. If you cannot find the McKanica® product, try to find a caulk remover that contains both alcohol and a solvent such as mineral spirits. The combination of alcohol and solvents is more potent and effective.

Are your products compatible with other products?

Contact Customer Service at 1-800-767-5656. They can give you general information on chemical compatibility between Sashco's products and others.

Can Big Stretch be used in my shower?

No, it would be best to use Lexel or MildewFree for these types of applications. Big Stretch can be used for other applications in the bathroom, such as base boards, crown molding, and sealing between the tub and floor.

Can I use Lexel in my bathroom?

Yes! Lexel is ideal for this application! Practice tooling the bead before applying since it skins over quickly

Can I use Lexel on the molding around my wood floors?

Yes! Clear Lexel may be used where you desire the surfaces to show through. This is especially helpful when natural woods are sealed, such as around molding or wood floors.

Can I use Lexel to adhere a mirror to the wall?

No. A mirror adhesive or mirror mastic is recommended. Some silver backings of mirrors can be affected by the solvents in Lexel and can lead to a "ghosting" image in the mirror wherever the Lexel is applied. In addition, the backing materials on mirrors are not always adequate for good adhesion. The backing can pull or tear away from the glass and stick to the wall, while the mirror falls to the ground. And who needs 7 years of bad luck?

Can I use Lexel to help with wallpapering?

Yes! Lexel used over wallpaper edges prevents curling and is an excellent use of its ultra-clear formula.

Can I use MildewFree to adhere a mirror to a wall?

No. MildewFree is not designed to hold a significant amount of weight to a wall. Use a mirror adhesive.

Can I use MildewFree to adhere tile? How many?

Yes, but only small tiles (8" or less) and only for replacing broken tiles.

Can I use MildewFree to repair grout? What size?

Yes, if you like the way the product looks, and with grout lines less than 1/4" wide. There are better options if you have textured grout or large grout joints.

Can Mor-Flexx be used as a mortar or grout?

Mor-Flexx is not a mortar replacement or an actual grout. Mor-Flexx is designed to repair gaps or cracks in existing mortar. Actual mortar has load-carrying, structural ability, Mor-Flexx does not. Mor-Flexx is designed to seal cracks, not carry structural loads.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

I applied MildewFree 2 days ago. When I turned my shower on, it started to run. Why?

There could be a number of issues going on, but most likely, the sealant hasn't had enough time to cure. The tube says 48 hours, but that's in ideal conditions. Especially if the humidity has been high and/or the temperature has been low, the MildewFree may not yet be cured enough to withstand direct moisture. Try giving it some more time to cure. Running a fan in the area will help speed curing, too.

I caulked my tub a couple weeks ago. Now the caulk is splitting down the middle. What's happening?

If you're like most people, you probably caulked around your tub while it was empty, which means the joint wasn't at it widest. The caulk probably got stressed a little and split. Try filling the tub with water and re-caulking. No need to remove what's already in there - if it's split down the middle, the fix is just applying more. Filling the tub with water will ensure the joint is at it's widest and the caulk will stretch correctly.

Is Big Stretch paintable?

Yes, Big Stretch is paintable within 4 hours with latex based paints, stains and primers and after 1 week with oil based paints, stains, and primers. Latex coatings are breathable and some are quite elastic, allowing the Big Stretch to continue to cure through it while maintaining a flexible film that won't crack.

Lower quality latex paints are seldom as elastic as Big Stretch and can crack while the caulk cures and shrinks. As such, it is best to let Big Stretch dry completely before painting with lower quality paints.

Some oil based products are not breathable, which can prevent the Big Stretch from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Big Stretch as it goes through its curing. Waiting the full week to cover with oil-based products helps ensure that cracking will not happen.

What product should I use if I have to use sulfamic acid to clean my walls (usually after tiling & grouting a shower wall)?

Lexel would be the best product to use. It is resistant to breakdown by sulfamic acid.

When do you use MildewFree vs. using Sashco's Lexel or Big Stretch?

Big Stretch is not recommended for use in bathrooms or kitchens, where there might be routine exposure to water. MildewFree and Lexel can be used in bathrooms and kitchens, but there are significant differences. MildewFree is water-based, and Lexel is solvent-based, so you can clean up tools, hands, etc. with MildewFree on them with water. Lexel will require solvents to clean up. MildewFree is easier to tool than Lexel, and has a flatter sheen to it. In addition, the colors of MildewFree have been matched to common kitchen and bath colors, and should blend into the joint a little more than Lexel, which is only available in clear or a bright white color.
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Big Stretch

Can Big Stretch be used around a hot tub or in a sauna, or in greenhouse?

No. A better choice in some of these areas is Sashco's Lexel. There is too much humidity, heat, condensation, etc. that can affect both the proper curing and performance of most water-based caulks, including Big Stretch.

Can Big Stretch be used as a crack filler or nail hole filler?

Yes, but Big Stretch shrinks quite a bit and could result in a "concave" hole which would need to have more caulk applied. Putty or spackling paste would be more efficient.

Can Big Stretch be used as a glazing on windows?

A soft gooey "sticky" sealer such as a butyl caulk is needed for back bedding. We do not recommend any of our products be used as glazing or as a back-bedding.

Can Big Stretch be used in my shower?

No, it would be best to use Lexel or MildewFree for these types of applications. Big Stretch can be used for other applications in the bathroom, such as base boards, crown molding, and sealing between the tub and floor.

Can Big Stretch be used on roof applications?

No. There is too much direct and extreme weather exposure. We recommend Sashco's Through the ROOF! instead.

Can I apply Big Stretch over an oil-based primer?

Yes, in most cases. Check to make sure the primer contains no waxes (and most don't). If there are no waxes are in the primer, allow the primer to thoroughly dry, then apply Big Stretch.

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I clean up Big Stretch with water?

Yes! Big Stretch is a water-based caulk, and will cleanup easily with water and a damp rag.

Can I still use Big Stretch if I leave it outside overnight in the cold?

Yes! Big Stretch is freeze-thaw stable through 5 cycles. So, you don't have to worry if you leave it in the cold overnight. It will still be good when it thaws out.

Can I use any kind of brush to tool Big Stretch?

Yes! Big Stretch may be tooled in a unique way that keeps your fingers out of the mess! Use a wet foam sponge (or foam paint brush) to create a finished look in larger gaps.

Can I use Big Stretch around my crown molding?

Yes. Big Stretch will adhere fine and perform well in such applications. Be aware that most wood-based crown molding will shrink significantly after installation and can cause the Big Stretch (or any caulking) to tear in some areas. As such, some of the caulk will need to be repaired once the crown molding has done the majority of its drying out and shrinking.

Can I use Big Stretch on EIFS?

Yes, Big Stretch will adhere to EIFS. But some precautions are in order to get the best performance out of Big Stretch:

- It is best to apply Big Stretch to the underlying EIFS base coat, rather than the latex paint applied over top, in order to ensure better and longer-lasting adhesion. The paint can readily delaminate from the base coat, which would take the Big Stretch with it.
- If Big Stretch is applied to bare polystyrene foam at some joints, it could fail if that joint undergoes any extreme movement. This is due to the foam being inherently weaker and therefore unable to handle the stress of the tension it might receive from the combination of movement and the tenacious adhesion of Big Stretch.
- When fillet beads are called for (such as at intersections of EIFS and window frames), it is very important to apply a generous bead in order to accommodate the sometimes large movement that can occur in these joints. A minimum 1/4"

Can I use Big Stretch rather than Slab?

That's not a good idea. Big Stretch is quite a bit softer than Slab, which means it will easily be stressed and torn by foot and vehicle traffic. Slab's formula is much tougher than Big Stretch, which makes it ideal for high-stress horizontal surfaces.

Can I use Big Stretch to seal cracks or expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Big Stretch to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Big Stretch in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Can you use Big Stretch on a mobile home or RV?

On a mobile home, yes. There are no substantial differences between mobile homes and conventional housing.

On an RV / motor homes, no. The non-porous materials often used & the type of direct movement and weather-exposure these vehicles experience often stress the Big Stretch too much. Lexel or Through The Roof would be better products to use for this application.

Does Big Stretch really stretch?

Yes! Big Stretch is super elastic and will twist, bend, stretch, or compress to absorb any movement a home can dish out. Big Stretch can span gaps up to 2" wide without cracking or losing adhesion.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How long will Big Stretch last? Does it come with a warranty?

Big Stretch comes with a limited lifetime warranty. Refer to warranty details on our website, on product packaging or on the Big Stretch brochure.

Is Big Stretch FDA approved for use in areas of food preparation, refrigerators, freezers, etc.?

It would be ok in the freezer / refrigerator environment (where FDA or USDA approval is not required), as the service range is -30F degrees to 250F degrees. However, it should not be used outside of those areas, as Big Stretch is not FDA or USDA approved.

Is Big Stretch paintable?

Yes, Big Stretch is paintable within 4 hours with latex based paints, stains and primers and after 1 week with oil based paints, stains, and primers. Latex coatings are breathable and some are quite elastic, allowing the Big Stretch to continue to cure through it while maintaining a flexible film that won't crack.

Lower quality latex paints are seldom as elastic as Big Stretch and can crack while the caulk cures and shrinks. As such, it is best to let Big Stretch dry completely before painting with lower quality paints.

Some oil based products are not breathable, which can prevent the Big Stretch from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Big Stretch as it goes through its curing. Waiting the full week to cover with oil-based products helps ensure that cracking will not happen.

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

What is Big Stretch?

Big Stretch is a water-based acrylic latex sealant.

What is the best way to remove Big Stretch?

It is not always necessary to remove Big Stretch. The surface can often be cleaned and the joint re-caulked

What will Big Stretch adhere to?

Big Stretch will adhere to most construction materials. Refer to theBig Stretch brochure for a more comprehensive list.

What will happen if I don't wait for the Big Stretch to cure before painting over it with an oil-based paint?

As the Big Stretch continues to cure and shrink, the paint will most likely crack over top of the Big Stretch. It's also possible for the Big Stretch itself to crack if it has not undergone the majority of its curing, as the oil-based stain can interfere with Big Stretch's ability to form the proper film. So, all in all, it is just best to wait. If you can't, be prepared to do some re-painting in a few areas.

When do you use MildewFree vs. using Sashco's Lexel or Big Stretch?

Big Stretch is not recommended for use in bathrooms or kitchens, where there might be routine exposure to water. MildewFree and Lexel can be used in bathrooms and kitchens, but there are significant differences. MildewFree is water-based, and Lexel is solvent-based, so you can clean up tools, hands, etc. with MildewFree on them with water. Lexel will require solvents to clean up. MildewFree is easier to tool than Lexel, and has a flatter sheen to it. In addition, the colors of MildewFree have been matched to common kitchen and bath colors, and should blend into the joint a little more than Lexel, which is only available in clear or a bright white color.

Which paints are best to use with Big Stretch?

Most any latex paint will be compatible with Big Stretch. However, be aware that some of the lower-end flat latex paints may crack over Big Stretch. Why? Low-end flat latex paints are full of solids and fillers that are not flexible. The Big Stretch will stretch with movement but the paint will not, causing the paint to crack over the surface of the caulk. Higher-end latex paints do not exhibit this problem as much.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.

Why does Big Stretch clear look white?

When Big Stretch® clear is first applied, it has a milky white appearance. Not to worry, though - as it dries, it turns clear.

Why is my paint cracking over the Big Stretch I applied? What can I do about it?

Most likely this is due to Big Stretch not being fully cured before the paint was applied. Lower-quality flat paints are especially susceptible to cracking since they are chock-full of fillers that make them rigid, but humid weather and abnormal movement can cause this at times, as well.

To fix this, first allow the Big Stretch to cure completely. (This can take anywhere from 4 days to 2 weeks, depending on temp and humidity). Follow with a new coat of primer and another coat of the same paint. It should blend in with no problems.

Will Big Stretch adhere to Protecto wrap?

No. The backing of Protecto wrap is polyethylene. It will work great as a bond breaker. Also, Big Stretch will not attack the bitumen/butyl adhesive of these kinds of self-adhering flashing materials.

Will Big Stretch help sound proof my home?

Sealing up cracks and cavities – like where the drywall meets the floor, around windows & doors, around electrical boxes, etc. – will always help reduce sound transmission in a home.  In addition, if a bead of Big Stretch is put on the wall studs prior to drywall installation, this can help further dampen sound transmission, as the sound waves will be bouncing off a much more elastic & soft material (the Big Stretch), rather than the hard stud wood.

Will my paint become shiny wherever I have applied it over Big Stretch?

NO. While many water-based latex sealants will "flash" (be shiny) under paint, Big Stretch will not. This means that your flat paint will indeed look flat, or your semi-gloss look semi-gloss instead of glossy over top of Big Stretch.
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Category

Are there products other than McKanica® to use in removing silicone?

There are several brands on the market. We have tested a few of them, and the McKanica® formula stood out as the best to remove a variety of silicone residues from the surface. If you cannot find the McKanica® product, try to find a caulk remover that contains both alcohol and a solvent such as mineral spirits. The combination of alcohol and solvents is more potent and effective.

Are your products compatible with other products?

Contact Customer Service at 1-800-767-5656. They can give you general information on chemical compatibility between Sashco's products and others.

Are your products environmentally safe? What's the story on VOCs?

Yes, all Sashco products are made in compliance with environmental regulations, and most of Sashco's products are water-based (giving them additional "environmental friendliness"). Sashco makes every effort to use the least toxic chemicals possible for its products, while still delivering the kind of performance required.

Can Big Stretch be used around a hot tub or in a sauna, or in greenhouse?

No. A better choice in some of these areas is Sashco's Lexel. There is too much humidity, heat, condensation, etc. that can affect both the proper curing and performance of most water-based caulks, including Big Stretch.

Can Big Stretch be used as a crack filler or nail hole filler?

Yes, but Big Stretch shrinks quite a bit and could result in a "concave" hole which would need to have more caulk applied. Putty or spackling paste would be more efficient.

Can Big Stretch be used as a glazing on windows?

A soft gooey "sticky" sealer such as a butyl caulk is needed for back bedding. We do not recommend any of our products be used as glazing or as a back-bedding.

Can Big Stretch be used in my shower?

No, it would be best to use Lexel or MildewFree for these types of applications. Big Stretch can be used for other applications in the bathroom, such as base boards, crown molding, and sealing between the tub and floor.

Can Big Stretch be used on roof applications?

No. There is too much direct and extreme weather exposure. We recommend Sashco's Through the ROOF! instead.

Can I apply Big Stretch over an oil-based primer?

Yes, in most cases. Check to make sure the primer contains no waxes (and most don't). If there are no waxes are in the primer, allow the primer to thoroughly dry, then apply Big Stretch.

Can I apply Through The Roof to wet surfaces?

Yes! Through the Roof can be applied to wet surfaces and has been found to work immediately when applied during a rain storm. Just be sure to use a stiff bristle paint brush, a metal trowel or foam brush to really work the product onto the surface, displacing all of the water. This will ensure the product will stick really well once all that water is gone. Through the Roof will take a bit longer than normal to cure when applied to a wet surface. It is NOT recommended for areas of continual submersion.

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I clean up Big Stretch with water?

Yes! Big Stretch is a water-based caulk, and will cleanup easily with water and a damp rag.

Can I paint Lexel?

Yes, Lexel is paintable with latex paints after 24-48 hours and after 7 days with oil based paints (longer with larger beads, or in cooler and/or humid conditions). Latex products are breathable and elastic, allowing the Lexel to continue to cure through it while maintaining a flexible film that won't crack. Some oil based products are not breathable, which can prevent the Lexel from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Lexel as it goes through its curing. Waiting for the Lexel to completely cure before painting over it with oil-based products is best and will help minimize any cracking paint.

Can I still use Big Stretch if I leave it outside overnight in the cold?

Yes! Big Stretch is freeze-thaw stable through 5 cycles. So, you don't have to worry if you leave it in the cold overnight. It will still be good when it thaws out.

Can I use an oil-based paint with eXact color?

No. Several bad things can happen, depending on the oil-based paint's formula:
- It won't mix in properly, like oil-in-water, and give uneven coloring
- It can cause the Exact Color to de-stabilize and congeal
- It can lead to the finished caulk being sticky when it dries
- It can lead to the dried caulk having poor performance and poor endurance

Can I use any color latex paint in eXact color?

YES! You can get an exact match to your paint when you mix it with eXact color.

Can I use any kind of brush to tool Big Stretch?

Yes! Big Stretch may be tooled in a unique way that keeps your fingers out of the mess! Use a wet foam sponge (or foam paint brush) to create a finished look in larger gaps.

Can I use any of your products with asphalt?

All of our sealant products will adhere well to asphalt; however, be aware that asphalt does not have much internal strength itself and, as such, readily fails on its own under stress. Repairs and regular maintenance will most likely be required wherever there is asphalt.

Can I use anything other than backer rod or Grip Strip as a bond breaker?

Yes! Clear packing tape (or any other kind of mylar tape) is also a common form of a bond breaker. If you are already at the desired depth, just place a piece of tape over the back of the joint and apply your caulking or chinking. You can also use duct tape or polyethylene tape (like Poly Masking Tape).

Can I use Big Stretch around my crown molding?

Yes. Big Stretch will adhere fine and perform well in such applications. Be aware that most wood-based crown molding will shrink significantly after installation and can cause the Big Stretch (or any caulking) to tear in some areas. As such, some of the caulk will need to be repaired once the crown molding has done the majority of its drying out and shrinking.

Can I use Big Stretch on EIFS?

Yes, Big Stretch will adhere to EIFS. But some precautions are in order to get the best performance out of Big Stretch:

- It is best to apply Big Stretch to the underlying EIFS base coat, rather than the latex paint applied over top, in order to ensure better and longer-lasting adhesion. The paint can readily delaminate from the base coat, which would take the Big Stretch with it.
- If Big Stretch is applied to bare polystyrene foam at some joints, it could fail if that joint undergoes any extreme movement. This is due to the foam being inherently weaker and therefore unable to handle the stress of the tension it might receive from the combination of movement and the tenacious adhesion of Big Stretch.
- When fillet beads are called for (such as at intersections of EIFS and window frames), it is very important to apply a generous bead in order to accommodate the sometimes large movement that can occur in these joints. A minimum 1/4"

Can I use Big Stretch rather than Slab?

That's not a good idea. Big Stretch is quite a bit softer than Slab, which means it will easily be stressed and torn by foot and vehicle traffic. Slab's formula is much tougher than Big Stretch, which makes it ideal for high-stress horizontal surfaces.

Can I use Big Stretch to seal cracks or expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Big Stretch to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Big Stretch in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Can I use Conceal on the interior of my home?

Yes! Be sure to follow all proper application instructions as outlined in the Conceal info sheet.

Can I use eXact color for exterior applications?

Yes. eXact color is exellent for both interior and exterior applications.

Can I use Lexel in my bathroom?

Yes! Lexel is ideal for this application! Practice tooling the bead before applying since it skins over quickly

Can I use Lexel in my greenhouse or sauna (areas of high humidity / moisture)?

Yes. The smell of the solvents during early cure can sometimes be bothersome, so be sure to let it cure first before using the sauna.

Can I use Lexel on my camper/RV?

Lexel® is highly recommended for most surfaces on RV's/ Campers. It can be used on rubber roof membranes; however, while it will adhere as usual to the rubber membrane, it may tend to ripple or warp the rubber membranes. Cosmetically, it may not look good, but the performance of both the Lexel® and the roof remain the same. That said, it's a good idea to test the Lexel® first to ensure the aesthetic issues are OK. In addition, some RV's / Campers use polyethylene and polypropylene materials. Lexel® will not stick to them, so keep your eye out.

Can I use Lexel on the molding around my wood floors?

Yes! Clear Lexel may be used where you desire the surfaces to show through. This is especially helpful when natural woods are sealed, such as around molding or wood floors.

Can I use Lexel to adhere a mirror to the wall?

No. A mirror adhesive or mirror mastic is recommended. Some silver backings of mirrors can be affected by the solvents in Lexel and can lead to a "ghosting" image in the mirror wherever the Lexel is applied. In addition, the backing materials on mirrors are not always adequate for good adhesion. The backing can pull or tear away from the glass and stick to the wall, while the mirror falls to the ground. And who needs 7 years of bad luck?

Can I use Lexel to fill cracks in my driveway?

Sashco's Slab is the better choice and is made specifically to withstand high foot and vehicle traffic. Lexel tends to be too soft for these types of applications.

Can I use Lexel to help with wallpapering?

Yes! Lexel used over wallpaper edges prevents curling and is an excellent use of its ultra-clear formula.

Can I use MildewFree to adhere a mirror to a wall?

No. MildewFree is not designed to hold a significant amount of weight to a wall. Use a mirror adhesive.

Can I use MildewFree to adhere tile? How many?

Yes, but only small tiles (8" or less) and only for replacing broken tiles.

Can I use MildewFree to repair grout? What size?

Yes, if you like the way the product looks, and with grout lines less than 1/4" wide. There are better options if you have textured grout or large grout joints.

Can I use Mor-Flexx around my fireplace?

Yes, as long as the Mor-Flexx and the stone / brick it's sticking to won't get hotter than 250 degrees F (121 degrees C).

Can I use simple universal pigments in eXact color, instead of paint?

Yes, when mixed by experienced professionals. Contact Sashco for detailed guidance if you desire to use universal pigments instead of paint. Of course, it's best to simply use your color paint to ensure an eXact color match every time.

Can I use Slab in areas of hydrostatic pressure?

No. That's not a great application for Slab. It has not been tested for those conditions and is not resistant to such pressures.

Can I use Slab in concrete expansion joints?

Yes. Slab will adhere well and perform well. Just be aware that expansion joints do just that

Can I use Slab on asphalt?

Yes, Slab will adhere well to asphalt; however, be aware that asphalt is an inherently weak material. It tends to crumble and lose adhesion to itself over time. Slab will stick around for the long haul, but you may find some asphalt stuck to the back of the caulk when the asphalt cracks.

Can I use Slab to repair a tennis court surface?

No, that's not a good idea for a couple of reasons:

1) Tennis courts are typically made of modified asphalt, an inherently weak substrate. When Slab is attached to something already weak, substrate failure is likely.
2) Slab is supposed to be recessed, not flush with the surface, in order to last and perform properly. This recess will continue to cause the tennis balls to bounce and spin unpredictably and thus not solve the problem.

It would be better to use a sealant that is almost 100% solids that would be flush with the surface.

Can I use the dispensing nozzle instead of the threaded cap to mix my eXact color?

No. It might work OK for mixing the paint in, but it will not work when the activator is mixed into the colored base. Be sure to follow the given directions to ensure proper mixing and application.

Can I use Through the Roof on my camper/RV?

Through the Roof!® is highly recommended for most surfaces on RV's/ Campers. It can be used on rubber roof membranes; however, while it will adhere as usual to the rubber membrane, it may ripple or warp the rubber membranes over time. Cosmetically, it may not look good, but the performance of the Through the Roof!® remains the same. Therefore, it's a good idea to test Through the Roof!® to make sure the final appearance will be acceptable. In addition, some RV's / Campers use polyethylene and polypropylene materials. Through the Roof!® will not stick to them, so keep your eye out.

Can I use Through the Roof to coat my entire roof? Can I paint a wall with it to protect it from moisture?

Through the Roof is not recommended to be used as a full roof or wall coating. Because it remains somewhat soft and flexible, it tends to attract dirt and debris which is cosmetically unattractive. Also, if it is on a roof that may be walked on, it may become sticky or tacky under the sun, causing you to stick to it. Conversely, in cold, wet or snowy weather, it may become slippery, making it unsafe to walk on.

Can I use Through the Roof to seal or waterproof canvas?

Yes. Through the Roof brush grade can be used to seal tears in canvas. It may also work to water-proof canvas. To waterproof canvas, dilute with some solvent (say 1 part solvent to 5 parts Through the Roof) and apply. In cold weather, the canvas would get a bit on the stiff side but it would not affect performance. And again Sashco can't guarantee performance as we have not done any official testing on this application.

Can I use your chinking or caulking over an epoxy-based paint?

In general, yes. However, it can vary by brand. Allow 1 week dry time, and consider scuffing up the edges of the joint since most epoxies dry very hard, making adhesion more difficult. Scuffing up the edges of the joints will provide for stronger adhesion.

Can Lexel be used in a non-fish aquarium for animals such as lizards, gerbils, etc.?

No! Lexel can be toxic to animals of any kind because of the solvents in it.

Can Lexel be used in a swimming pool or hot tub?

Lexel is not a "marine" type sealant and is not recommended to be used in those areas, especially because we have not tested it with pool or hot tub chemicals, nor under water-submersion pressure . A "marine" type sealant or adhesive is recommended for those types of applications, as well as poly-sulfide or urethane sealants.

Can Lexel be used in an outdoor fish pond?

Yes. It must fully cure before putting in fish or other animals. This is okay because there is more "space" and larger volume of water into which the solvents can dissipate.

Can Lexel be used in food preparation areas or in a refrigerator or freezer?

Lexel is not FDA or USDA approved (and it has never been sought). For this reason, it is not recommended in food preparation areas. In refrigerators or freezers where approval is not needed, it will perform very well and hold up to the cold temperatures and can be cleaned with abrasive cleaners.

Can Lexel be used on a kayak? A boat?

Yes - below water line at your own risk since we haven't done the testing. We've had some very good feedback from customers on boats and kayaks, both above and below the waterline, with no significant difference between salt water and freshwater.

Can Lexel be used to repair a pond, a fountain, a bird bath, an aquarium, etc?

Depending on the exact application, it can be used to repair cracks or leaks in all of the above. Allow it to fully cure before putting animals in. Don't use in aquariums or enclosures with animals prone to chewing (gerbils, hamsters, rats, etc.) and only use in large aquariums (like outdoor ponds) in aquatic applications.

Can Lexel be used to seal drums with oil / gas / solvents inside?

No, not if they have any contact with the Lexel. Oil / gas / solvents will soften and dissolve the polymer in Lexel.

Can MildewFree be used as a glazing for windows?

No. Use a sealant specifically designed for window glazing or back bedding.

Can MildewFree be used in areas of submersion (i.e. a pond, pool, hot tub, aquarium, green house, bird bath, on boats and kayaks below water level)?

No, MildewFree is not designed for continuous submersion. It would be best to use a sealant approved for underwater use. Contact Customer Service for more guidance in these types of applications.

Can Mor-Flexx be used as a mortar or grout?

Mor-Flexx is not a mortar replacement or an actual grout. Mor-Flexx is designed to repair gaps or cracks in existing mortar. Actual mortar has load-carrying, structural ability, Mor-Flexx does not. Mor-Flexx is designed to seal cracks, not carry structural loads.

Can Mor-Flexx be used on a pool deck to repair cracks? Driveway? Sidewalk?

Mor-Flexx is not recommended for use on these horizontal surfaces. Caulk joints applied to pool decks, driveways, and sidewalks in particular are exposed to prolonged water submersion, the abrasion and abuse of high foot-traffic, and chemical exposure, to name a few. Instead, use Sashco's Slab, which is specifically designed to seal cracks in these areas

Can Mor-Flexx be used on expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Mor-Flexx to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Mor-Flexx in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Can you use Big Stretch on a mobile home or RV?

On a mobile home, yes. There are no substantial differences between mobile homes and conventional housing.

On an RV / motor homes, no. The non-porous materials often used & the type of direct movement and weather-exposure these vehicles experience often stress the Big Stretch too much. Lexel or Through The Roof would be better products to use for this application.

Does Big Stretch really stretch?

Yes! Big Stretch is super elastic and will twist, bend, stretch, or compress to absorb any movement a home can dish out. Big Stretch can span gaps up to 2" wide without cracking or losing adhesion.

Does Mor-Flexx adhere to rubber?

Yes, Mor-Flexx will adhere to rubber. It's a good idea to scuff up the rubber a bit where you want the Mor-Flexx to stick to provide for best adhesion.

Does Slab come in quart cartridges, 5 gallon pails, etc.?

Right now, Slab is available in 10.5 oz. standard caulking cartridges. However, please let us know if you'd like to see Slab in larger sizes. We're always happy to hear from our customers about their specific needs.

Does Slab contain a mildewcide?

Yes, Slab contains a pretty hefty dose of mildewcide to help prevent growth of mold and mildew on the surface of the caulk.

Does Through The Roof stick to most roofing materials?

Yes! Through The Roof will adhere to fiberglass / asphalt shingles, cedar shakes, plywood, water-based acrylic roof coatings, cement, slate and glazed tiles, asphalt roof cement, and many more. Refer to theThrough the Roof brochure for a more comprehensive list.

How can I remove Lexel?

Lexel is not very easy to remove (as you've probably discovered). Mineral spirits will do the trick. Apply some and allow it to sit, then use a scraper or razor blade to remove Lexel. Commonly available silicone removers based on mineral spirits will also do the trick and are often less messy. In particular, McKanica Silicone Caulk Remover works great.

How do I clean up Slab that is still wet?

Soap and water will do the trick. Easy!

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How does cross-linking improve MildewFree?

The cross-linking within the MildewFree formula will toughen the surface of the caulk so it can be routinely scrubbed to remove soap scum, dirt, and other residue. A cross-linked film also prevents the sealant from holding a lot of moisture, which can soften or damage the sealant over time.

How long can I store my mixed eXact color?

When sealed with the clear cap, mixed eXact color can be stored and used for 1 year after being mixed.

How long will Big Stretch last? Does it come with a warranty?

Big Stretch comes with a limited lifetime warranty. Refer to warranty details on our website, on product packaging or on the Big Stretch brochure.

How long will Lexel last? Does it come with a warranty?

Lexel comes with a limited lifetime warranty. Refer to warranty details on our website, on the product packaging or the Lexel brochure.

How long will MildewFree last? Does it come with a warranty?

MildewFree is one of a kind in the market. It comes with a 7 year warranty that includes labor should the product need to be re-installed, as well as Sashco's Limited Lifetime Warranty applicable to all our sealants. Refer to warranty details on the packaging or the MildewFree brochure.

How long will Through the Roof last? Does it come with a warranty?

Through the Roof comes with a limited lifetime warranty. Refer to warranty details Refer to warranty details on our website, on the product packaging or the Through the Roof brochure.

I applied MildewFree 2 days ago. When I turned my shower on, it started to run. Why?

There could be a number of issues going on, but most likely, the sealant hasn't had enough time to cure. The tube says 48 hours, but that's in ideal conditions. Especially if the humidity has been high and/or the temperature has been low, the MildewFree may not yet be cured enough to withstand direct moisture. Try giving it some more time to cure. Running a fan in the area will help speed curing, too.

I applied Slab today and it's supposed to rain tomorrow. Do I need to cover it?

Yes, it would be best to cover Slab if you expect rain within 24 hours of application. Simply cover with a tarp or something similar to keep rain off of it.

I applied Slab yesterday and it's still soft. How long will it take for it to dry? Can I drive or walk on it yet?

Dry time will depend on how much Slab was applied, the temperature and humidity. Larger beads will take longer to cure, and cooler and more humid conditions will also extend the cure time. In ideal temps and humidity (less than 50% humidity and 70

I caulked my tub a couple weeks ago. Now the caulk is splitting down the middle. What's happening?

If you're like most people, you probably caulked around your tub while it was empty, which means the joint wasn't at it widest. The caulk probably got stressed a little and split. Try filling the tub with water and re-caulking. No need to remove what's already in there - if it's split down the middle, the fix is just applying more. Filling the tub with water will ensure the joint is at it's widest and the caulk will stretch correctly.

I have tire tread marks on the Slab I just applied. How do I clean those off?

Soap and water should remove those tread marks from the Slab. You might need to use a nylon brush (the kind you use on dishes) to get at any stubborn spots.

I put Slab down on my driveway a few hours ago and didn't realize I'd need to get my car out of the garage. Now what?

Put some boards or plywood over the product and drive on that instead. Then be sure to avoid driving on it for at least 24 hours to allow it to cure.

I see that Slab has a cancer warning on the cartridge. Should I be concerned?

We use naturally occurring silica sand in Slab to give it texture (yes, the same sand you can find on the beach). A small portion of this sand has crystalline silica. It is the airborne, breathable portion of the crystalline silica that is considered a carcinogen. As long as you don't sand or grind the surface of the Slab material after it is cured without using proper respirator equipment, your exposure to any crystalline silica is less than it would be if you were to visit the beach.

I was a bit messy and got some Slab where I don't want it. Now it's dry. How do I remove it?

Try a citrus-based cleaner first. That should help loosen it up some. Then try scraping at it with a plastic scraper to loosen it more and pull it off. If that doesn't work, you can try mineral spirits to loosen it more.

Is Big Stretch FDA approved for use in areas of food preparation, refrigerators, freezers, etc.?

It would be ok in the freezer / refrigerator environment (where FDA or USDA approval is not required), as the service range is -30F degrees to 250F degrees. However, it should not be used outside of those areas, as Big Stretch is not FDA or USDA approved.

Is Big Stretch paintable?

Yes, Big Stretch is paintable within 4 hours with latex based paints, stains and primers and after 1 week with oil based paints, stains, and primers. Latex coatings are breathable and some are quite elastic, allowing the Big Stretch to continue to cure through it while maintaining a flexible film that won't crack.

Lower quality latex paints are seldom as elastic as Big Stretch and can crack while the caulk cures and shrinks. As such, it is best to let Big Stretch dry completely before painting with lower quality paints.

Some oil based products are not breathable, which can prevent the Big Stretch from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Big Stretch as it goes through its curing. Waiting the full week to cover with oil-based products helps ensure that cracking will not happen.

Is it okay if the product freezes in transit?

Yes. All of Sashco's products are freeze-thaw stable through 5 cycles. It is best to make sure the product is brought to room temperature prior to application to ensure proper thickness of the product.

Is Lexel a silicone?

No. Lexel is a co-polymer, or synthetic, rubber. It has no silicone rubber in it. Synthetic rubbers like Lexel are more durable, are extremely elastic and have UV inhibitors. Lexel can often times be used in areas where a silicone is recommended.

Is Lexel electrically conductive?

Lexel is better characterized as an insulator or dialectric. It does not conduct electricity. However, Sashco does not recommend Lexel being used for direct electrical applications.

Is Lexel fire safe?

No! It will burn

Is MildewFree a silicone?

No, MildewFree is not a silicone. It is an all acrylic sealant.

Is MildewFree paintable?

Yes, you can paint over MildewFree after 4 hours with most high quality water-based elastomeric paints. For best results, wait at least 24 hours (or longer in cool or humid conditions) before painting. Wait at least a week before painting with oil-based paints, which can stay tacky if the sealant is not fully cured.

Is Slab waterproof?

Once fully cured, yes. During early cure, be sure to protect it from heavy rains, as that could cause the product to washout.

Is there a way to prevent air bubbles in my eXact color when I mix it?

No. There will inevitably be some air bubbles that form when it is mixed.

Is Through The Roof easy to clean up?

Yes! Tools may be cleaned with mineral spirits or paint thinner. We recommend cleaning hands with a citrus-based or waterless hand cleansers.

Is Through The Roof Waterproof?

Yes! Through The Roof is waterproof

Is your chinking / caulking supposed to stay "soft"?

Yes. All of our chinking and caulking products are formulated to retain their elasticity (or "softness") for many years.

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

My dog just drank some of the water I used when chinking / caulking. What should I do?

Contact a local veterinary clinic as soon as possible. You dog will most likely be just fine, but it's best to contact a vet to get immediate care instructions.

On the average, what is the life expectancy of Through The Roof vs. asphalt?

In our testing, we've found Through the Roof to last at least 20 times longer. The testing is still going, so that is likely to go up.

Slab cracked! What happened, and how can I fix it?

If Slab cracked down the middle, that usually means either: a) the joint is now wider and it stressed the caulk too much or b) Slab may have been applied either too thin or too thick and isn't able to stretch properly. In either case, the fix is easy:

1. Use a razor blade to release any tension in the caulk. 2. Clean the joint with soap and water to remove dust, gravel, sand, etc. 3. Insert some of Sashco's Pre-Caulking Filler Rope (or similar), if some wasn't used before. 4. Apply more Slab over the filler rope, making sure it's sticking to the leftover product. Smooth the bead to ensure good adhesion.

If Slab is no longer sticking to the side of the joint, you'll need to cut it out and re-do it. That's usually caused by some sort of chemical that Slab won't stick to, or the substrate itself being weak. (This is common with asphalt or concrete that was poured in cold temps and wasn't able to properly cure itself.) It will help to sand down the sides of the joint with a wire brush to ensure any loose concrete is removed and the Slab will be sticking to a good, sound surface.

Slab is too dark for my concrete. What can I do to help it match better?

The color of Slab was chosen to match concrete that is aged and has darkened. If your concrete is newer, it may be darker than you need. Time will darken your concrete some so that Slab will eventually blend in. Until then, Slab is paintable. Feel free to paint over it with paints made specifically for concrete floors to get a better match.

The surface of my concrete is spalling. Can I use Slab to repair it?

No. Slab is not a good "glue" for spalling concrete. It would be best to remove the spalling or consider having a concrete contractor come out to fix it.

What are isocyanates? Why does it matter that Slab doesn't have them?

Isocyanates are highly toxic, both to breathe and to touch. Many concrete repair products contain them. Slab doesn't. So breathe easy, save the planet and fix your concrete cracks all at the same time.

What are the benefits of a co-polymer rubber formula like Lexel?

Depending on the type of polymers used, synthetic rubbers like Lexel are more durable, have high tensile strength and higher UV inhibitors. They also shrink more. The solvents in Lexel "clean" the surface for better adhesion and the additives in it soften it and make it more flexible and elastic.

What do you use to tool your chinking or caulking?

A variety of tools and techniques can be used

What is Big Stretch?

Big Stretch is a water-based acrylic latex sealant.

What is Lexel made of?

Lexel is a solvent-based co-polymer rubber sealant.

What is MildewFree?

MildewFree is a water-based all acrylic sealant that has been designed and tested to be resistant to mildew growth.

What is Slab?

Slab is a 100% water-based acrylic latex caulk for concrete crack repair. Unlike other concrete repair products, it's not sticky and difficult to apply, nor does it dry hard and crack. Slab combines excellent adhesion and superior elasticity to result in a concrete crack repair that lasts.

What is the best way to remove Big Stretch?

It is not always necessary to remove Big Stretch. The surface can often be cleaned and the joint re-caulked

What is the best way to remove MildewFree?

First, peel and scrape away as much material as possible. Be careful not to damage soft or brittle surfaces. Then, if you prefer, a solvent (caulk remover) can be used to soften the caulk film and make it easier to remove the residue. Make sure the chemical is approved for your surface to avoid damaging it. If you prefer not to use solvents, you may soften the residue with soap and water and continue to scrape or scrub with an abrasive cleaning pad until the surface is clean.

What is the proper depth (thickness) of a caulking or chinking line?

A general rule of thumb to follow when caulking is to make the joint half as deep as it is wide. This means on a 1 inch caulking line, the depth should be 1/2" deep (or thick).

The joint depth should never be thinner than 1/4" and never thicker than 1/2".

What is the shelf life of your products after they've been opened?

That will vary depending on how the product is stored and how old the product was when purchased. In general, you will get one more year out of an opened product when properly sealed and stored in moderate temps (between 50⁰ and 90⁰F).

Storage instructions:

For squeeze tubes and capped cartridges:
Clean out the nozzle and cover with the cap that came with the product.

For regular cartridges:
Clean out the nozzle as best you can, then cover tightly with plastic wrap. Tape around the plastic wrap, or wrap tightly with a rubberband.

For containers or buckets:
Cover tightly with the lid that came with the product.

What precautions should I take when using chemical cleaners or strippers?

It's always important to use proper safety equipment (skin, eye and respiratory equipment) when using chemicals. It is also important to be sure that any chemical used is thoroughly neutralized. If not neutralized, any residual chemical can cause unsound wood to form, which can then affect long-term performance of the products used on top of the wood.

It is best to talk to the company who has made the chemical to get their advice on how to neutralize it. And then, of course, follow up when finished with some pH strips, available at most paint stores. The wood surface should be close to neutral (7) before moving forward with application of any finishing products.

What product should I use if I have to use sulfamic acid to clean my walls (usually after tiling & grouting a shower wall)?

Lexel would be the best product to use. It is resistant to breakdown by sulfamic acid.

What solvents does Lexel have in it?

Download the product-specific MSDS for more information.

What solvents does Through the Roof have in it?

Refer to the MSDS for more information.

What type of warranty comes with your products?

The warranties for each product are included on their respective labels and accompanying literature.

What will Big Stretch adhere to?

Big Stretch will adhere to most construction materials. Refer to theBig Stretch brochure for a more comprehensive list.

What will happen if I don't wait for the Big Stretch to cure before painting over it with an oil-based paint?

As the Big Stretch continues to cure and shrink, the paint will most likely crack over top of the Big Stretch. It's also possible for the Big Stretch itself to crack if it has not undergone the majority of its curing, as the oil-based stain can interfere with Big Stretch's ability to form the proper film. So, all in all, it is just best to wait. If you can't, be prepared to do some re-painting in a few areas.

What will happen if it rains shortly after I have applied Through the Roof?

Through the Roof can actually be applied to wet surfaces and has been found to work immediately when applied during a rain storm. If it gets wet during or shortly after application, it will simply take a bit longer than normal to cure. It is NOT recommended for areas of continual submersion.

What's the difference between backer rod and Grip Strip?

Both are bond breakers, but backer rod is usually round and Grip Strip is trapezoid shaped.

When do you use MildewFree vs. using Sashco's Lexel or Big Stretch?

Big Stretch is not recommended for use in bathrooms or kitchens, where there might be routine exposure to water. MildewFree and Lexel can be used in bathrooms and kitchens, but there are significant differences. MildewFree is water-based, and Lexel is solvent-based, so you can clean up tools, hands, etc. with MildewFree on them with water. Lexel will require solvents to clean up. MildewFree is easier to tool than Lexel, and has a flatter sheen to it. In addition, the colors of MildewFree have been matched to common kitchen and bath colors, and should blend into the joint a little more than Lexel, which is only available in clear or a bright white color.

When I use eXact color, will the color be uniform throughout the cartridge?

Yes. If eXact color is mixed as directed (either by hand or in a mixing machine), the paint will be distributed evenly throughout the cartridge before the activator is added and mixed in. Once thickened by the activator, the color will be uniform throughout the cartridge.

Where should I store unmixed cartridges of eXact color?

It is best to store them in a cool (but not freezing), dry place. Storing in hot temperatures can cause the product to skin over, which will in turn affect mixing, final appearance and performance.

Where should I use Slab vs. Sashco's Mor-Flexx

Slab is specifically made for horizontal concrete, brick and stone surfaces. It's specifically formulated to withstand heavy foot and vehicle traffic. As part of that, Slab shrinks more than Mor-Flexx and is design to be recessed below the surface, which helps with durability. Mor-Flexx is ideal for vertical applications: walls, around your chimney, brick, stucco and the like. It comes in a wide variety of colors to match all of those different surfaces, but isn't tough enough to handle foot and vehicle traffic. Mor-Flexx doesn't shrink nearly as much as Slab, remaining flush with the surface, which is the ideal aesthetic for a vertical surface where you need the repair to blend in.

Which paints are best to use with Big Stretch?

Most any latex paint will be compatible with Big Stretch. However, be aware that some of the lower-end flat latex paints may crack over Big Stretch. Why? Low-end flat latex paints are full of solids and fillers that are not flexible. The Big Stretch will stretch with movement but the paint will not, causing the paint to crack over the surface of the caulk. Higher-end latex paints do not exhibit this problem as much.

Why do I have to fill checks and cracks?

Checks allow moisture and wood-destroying fungi to find their way deep into the interior of wood. When fungi have a food source (the wood), moisture, oxygen and the right temperature, they can lead to rot, which, in some cases, can negatively affect the structural integrity of the home. And it can be very costly to fix rot. Filling in those checks and cracks will save you money and stress down the line.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.

Why does Big Stretch clear look white?

When Big Stretch® clear is first applied, it has a milky white appearance. Not to worry, though - as it dries, it turns clear.

Why doesn't the color of the eXact color match my paint when it comes out of the tube?

Don't worry! As the product dries, it will be an eXact color match. But out of the tube, it may look a little lighter in color.

Why is my paint cracking over the Big Stretch I applied? What can I do about it?

Most likely this is due to Big Stretch not being fully cured before the paint was applied. Lower-quality flat paints are especially susceptible to cracking since they are chock-full of fillers that make them rigid, but humid weather and abnormal movement can cause this at times, as well.

To fix this, first allow the Big Stretch to cure completely. (This can take anywhere from 4 days to 2 weeks, depending on temp and humidity). Follow with a new coat of primer and another coat of the same paint. It should blend in with no problems.

Why should I use water- based products?

Certainly, water-based products are not mandatory, and there are some solvent-based products that perform well. Water-based products are generally much easier to apply and clean up, and they pose less risk to your health, the environment and are a lower fire hazard. The environmental movement of the last several years has driven considerable innovation in the chemistry of water-based coatings and sealants and these products are now offering excellent levels of performance that would have been difficult just a few years ago.

Will Big Stretch adhere to Protecto wrap?

No. The backing of Protecto wrap is polyethylene. It will work great as a bond breaker. Also, Big Stretch will not attack the bitumen/butyl adhesive of these kinds of self-adhering flashing materials.

Will Big Stretch help sound proof my home?

Sealing up cracks and cavities – like where the drywall meets the floor, around windows & doors, around electrical boxes, etc. – will always help reduce sound transmission in a home.  In addition, if a bead of Big Stretch is put on the wall studs prior to drywall installation, this can help further dampen sound transmission, as the sound waves will be bouncing off a much more elastic & soft material (the Big Stretch), rather than the hard stud wood.

Will Lexel adhere well to cured concrete that has gotten wet?

Yes, but some problems may surface. Since concrete is porous, the Lexel may have a hard time maintaining adhesion. As the sun comes out and heats up the moisture in the concrete, it will try to escape and may stress the Lexel to the point of failure. Also, many concrete form release agents contain silicones, waxes, etc. that can interfere with Lexel adhesion

Will Lexel help prevent air leaks in my home?

Yes! Lexel keeps the weather outside. It seals thresholds, sills, siding, vents, pipes and air conditioners. Lexel is also good for leaky air ducts which can heat up your walls instead of your living area. Use Lexel to permanently seal all connections.

Will Lexel prevent radon gas infiltration?

With radon gas, it is best to set up a proper ventilation system to direct the gas outdoors. Lexel can temporarily keep radon gas from getting to the interior of the home; however, eventually the gas can diffuse through any sealant (including Lexel), requiring ventilation.

Will Lexel stay clear looking?

Yes! Lexel will always remain ultra-clear. Plus, Lexel seals beautifully while resisting mildew and dust collection. Once cured, it can withstand scrubbing with abrasive household cleaners.

Will my paint become shiny wherever I have applied it over Big Stretch?

NO. While many water-based latex sealants will "flash" (be shiny) under paint, Big Stretch will not. This means that your flat paint will indeed look flat, or your semi-gloss look semi-gloss instead of glossy over top of Big Stretch.

Will the gloss or sheen of eXact color match that of my paint?

With semi-gloss or gloss paints the match will be very close. With flat or eggshell sheens the eXact color will be a little glossier.
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Caulking

Are there products other than McKanica® to use in removing silicone?

There are several brands on the market. We have tested a few of them, and the McKanica® formula stood out as the best to remove a variety of silicone residues from the surface. If you cannot find the McKanica® product, try to find a caulk remover that contains both alcohol and a solvent such as mineral spirits. The combination of alcohol and solvents is more potent and effective.

Are your products compatible with other products?

Contact Customer Service at 1-800-767-5656. They can give you general information on chemical compatibility between Sashco's products and others.

Are your products environmentally safe? What's the story on VOCs?

Yes, all Sashco products are made in compliance with environmental regulations, and most of Sashco's products are water-based (giving them additional "environmental friendliness"). Sashco makes every effort to use the least toxic chemicals possible for its products, while still delivering the kind of performance required.

Can Big Stretch be used around a hot tub or in a sauna, or in greenhouse?

No. A better choice in some of these areas is Sashco's Lexel. There is too much humidity, heat, condensation, etc. that can affect both the proper curing and performance of most water-based caulks, including Big Stretch.

Can Big Stretch be used as a crack filler or nail hole filler?

Yes, but Big Stretch shrinks quite a bit and could result in a "concave" hole which would need to have more caulk applied. Putty or spackling paste would be more efficient.

Can Big Stretch be used as a glazing on windows?

A soft gooey "sticky" sealer such as a butyl caulk is needed for back bedding. We do not recommend any of our products be used as glazing or as a back-bedding.

Can Big Stretch be used in my shower?

No, it would be best to use Lexel or MildewFree for these types of applications. Big Stretch can be used for other applications in the bathroom, such as base boards, crown molding, and sealing between the tub and floor.

Can Big Stretch be used on roof applications?

No. There is too much direct and extreme weather exposure. We recommend Sashco's Through the ROOF! instead.

Can I apply Big Stretch over an oil-based primer?

Yes, in most cases. Check to make sure the primer contains no waxes (and most don't). If there are no waxes are in the primer, allow the primer to thoroughly dry, then apply Big Stretch.

Can I apply Through The Roof to wet surfaces?

Yes! Through the Roof can be applied to wet surfaces and has been found to work immediately when applied during a rain storm. Just be sure to use a stiff bristle paint brush, a metal trowel or foam brush to really work the product onto the surface, displacing all of the water. This will ensure the product will stick really well once all that water is gone. Through the Roof will take a bit longer than normal to cure when applied to a wet surface. It is NOT recommended for areas of continual submersion.

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I clean up Big Stretch with water?

Yes! Big Stretch is a water-based caulk, and will cleanup easily with water and a damp rag.

Can I paint Lexel?

Yes, Lexel is paintable with latex paints after 24-48 hours and after 7 days with oil based paints (longer with larger beads, or in cooler and/or humid conditions). Latex products are breathable and elastic, allowing the Lexel to continue to cure through it while maintaining a flexible film that won't crack. Some oil based products are not breathable, which can prevent the Lexel from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Lexel as it goes through its curing. Waiting for the Lexel to completely cure before painting over it with oil-based products is best and will help minimize any cracking paint.

Can I still use Big Stretch if I leave it outside overnight in the cold?

Yes! Big Stretch is freeze-thaw stable through 5 cycles. So, you don't have to worry if you leave it in the cold overnight. It will still be good when it thaws out.

Can I use an oil-based paint with eXact color?

No. Several bad things can happen, depending on the oil-based paint's formula:
- It won't mix in properly, like oil-in-water, and give uneven coloring
- It can cause the Exact Color to de-stabilize and congeal
- It can lead to the finished caulk being sticky when it dries
- It can lead to the dried caulk having poor performance and poor endurance

Can I use any color latex paint in eXact color?

YES! You can get an exact match to your paint when you mix it with eXact color.

Can I use any kind of brush to tool Big Stretch?

Yes! Big Stretch may be tooled in a unique way that keeps your fingers out of the mess! Use a wet foam sponge (or foam paint brush) to create a finished look in larger gaps.

Can I use any of your products with asphalt?

All of our sealant products will adhere well to asphalt; however, be aware that asphalt does not have much internal strength itself and, as such, readily fails on its own under stress. Repairs and regular maintenance will most likely be required wherever there is asphalt.

Can I use anything other than backer rod or Grip Strip as a bond breaker?

Yes! Clear packing tape (or any other kind of mylar tape) is also a common form of a bond breaker. If you are already at the desired depth, just place a piece of tape over the back of the joint and apply your caulking or chinking. You can also use duct tape or polyethylene tape (like Poly Masking Tape).

Can I use Big Stretch around my crown molding?

Yes. Big Stretch will adhere fine and perform well in such applications. Be aware that most wood-based crown molding will shrink significantly after installation and can cause the Big Stretch (or any caulking) to tear in some areas. As such, some of the caulk will need to be repaired once the crown molding has done the majority of its drying out and shrinking.

Can I use Big Stretch on EIFS?

Yes, Big Stretch will adhere to EIFS. But some precautions are in order to get the best performance out of Big Stretch:

- It is best to apply Big Stretch to the underlying EIFS base coat, rather than the latex paint applied over top, in order to ensure better and longer-lasting adhesion. The paint can readily delaminate from the base coat, which would take the Big Stretch with it.
- If Big Stretch is applied to bare polystyrene foam at some joints, it could fail if that joint undergoes any extreme movement. This is due to the foam being inherently weaker and therefore unable to handle the stress of the tension it might receive from the combination of movement and the tenacious adhesion of Big Stretch.
- When fillet beads are called for (such as at intersections of EIFS and window frames), it is very important to apply a generous bead in order to accommodate the sometimes large movement that can occur in these joints. A minimum 1/4"

Can I use Big Stretch rather than Slab?

That's not a good idea. Big Stretch is quite a bit softer than Slab, which means it will easily be stressed and torn by foot and vehicle traffic. Slab's formula is much tougher than Big Stretch, which makes it ideal for high-stress horizontal surfaces.

Can I use Big Stretch to seal cracks or expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Big Stretch to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Big Stretch in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Can I use Conceal on the interior of my home?

Yes! Be sure to follow all proper application instructions as outlined in the Conceal info sheet.

Can I use eXact color for exterior applications?

Yes. eXact color is exellent for both interior and exterior applications.

Can I use Lexel in my bathroom?

Yes! Lexel is ideal for this application! Practice tooling the bead before applying since it skins over quickly

Can I use Lexel in my greenhouse or sauna (areas of high humidity / moisture)?

Yes. The smell of the solvents during early cure can sometimes be bothersome, so be sure to let it cure first before using the sauna.

Can I use Lexel on my camper/RV?

Lexel® is highly recommended for most surfaces on RV's/ Campers. It can be used on rubber roof membranes; however, while it will adhere as usual to the rubber membrane, it may tend to ripple or warp the rubber membranes. Cosmetically, it may not look good, but the performance of both the Lexel® and the roof remain the same. That said, it's a good idea to test the Lexel® first to ensure the aesthetic issues are OK. In addition, some RV's / Campers use polyethylene and polypropylene materials. Lexel® will not stick to them, so keep your eye out.

Can I use Lexel on the molding around my wood floors?

Yes! Clear Lexel may be used where you desire the surfaces to show through. This is especially helpful when natural woods are sealed, such as around molding or wood floors.

Can I use Lexel to adhere a mirror to the wall?

No. A mirror adhesive or mirror mastic is recommended. Some silver backings of mirrors can be affected by the solvents in Lexel and can lead to a "ghosting" image in the mirror wherever the Lexel is applied. In addition, the backing materials on mirrors are not always adequate for good adhesion. The backing can pull or tear away from the glass and stick to the wall, while the mirror falls to the ground. And who needs 7 years of bad luck?

Can I use Lexel to fill cracks in my driveway?

Sashco's Slab is the better choice and is made specifically to withstand high foot and vehicle traffic. Lexel tends to be too soft for these types of applications.

Can I use Lexel to help with wallpapering?

Yes! Lexel used over wallpaper edges prevents curling and is an excellent use of its ultra-clear formula.

Can I use MildewFree to adhere a mirror to a wall?

No. MildewFree is not designed to hold a significant amount of weight to a wall. Use a mirror adhesive.

Can I use MildewFree to adhere tile? How many?

Yes, but only small tiles (8" or less) and only for replacing broken tiles.

Can I use MildewFree to repair grout? What size?

Yes, if you like the way the product looks, and with grout lines less than 1/4" wide. There are better options if you have textured grout or large grout joints.

Can I use Mor-Flexx around my fireplace?

Yes, as long as the Mor-Flexx and the stone / brick it's sticking to won't get hotter than 250 degrees F (121 degrees C).

Can I use simple universal pigments in eXact color, instead of paint?

Yes, when mixed by experienced professionals. Contact Sashco for detailed guidance if you desire to use universal pigments instead of paint. Of course, it's best to simply use your color paint to ensure an eXact color match every time.

Can I use Slab in areas of hydrostatic pressure?

No. That's not a great application for Slab. It has not been tested for those conditions and is not resistant to such pressures.

Can I use Slab in concrete expansion joints?

Yes. Slab will adhere well and perform well. Just be aware that expansion joints do just that

Can I use Slab on asphalt?

Yes, Slab will adhere well to asphalt; however, be aware that asphalt is an inherently weak material. It tends to crumble and lose adhesion to itself over time. Slab will stick around for the long haul, but you may find some asphalt stuck to the back of the caulk when the asphalt cracks.

Can I use Slab to repair a tennis court surface?

No, that's not a good idea for a couple of reasons:

1) Tennis courts are typically made of modified asphalt, an inherently weak substrate. When Slab is attached to something already weak, substrate failure is likely.
2) Slab is supposed to be recessed, not flush with the surface, in order to last and perform properly. This recess will continue to cause the tennis balls to bounce and spin unpredictably and thus not solve the problem.

It would be better to use a sealant that is almost 100% solids that would be flush with the surface.

Can I use the dispensing nozzle instead of the threaded cap to mix my eXact color?

No. It might work OK for mixing the paint in, but it will not work when the activator is mixed into the colored base. Be sure to follow the given directions to ensure proper mixing and application.

Can I use Through the Roof on my camper/RV?

Through the Roof!® is highly recommended for most surfaces on RV's/ Campers. It can be used on rubber roof membranes; however, while it will adhere as usual to the rubber membrane, it may ripple or warp the rubber membranes over time. Cosmetically, it may not look good, but the performance of the Through the Roof!® remains the same. Therefore, it's a good idea to test Through the Roof!® to make sure the final appearance will be acceptable. In addition, some RV's / Campers use polyethylene and polypropylene materials. Through the Roof!® will not stick to them, so keep your eye out.

Can I use Through the Roof to coat my entire roof? Can I paint a wall with it to protect it from moisture?

Through the Roof is not recommended to be used as a full roof or wall coating. Because it remains somewhat soft and flexible, it tends to attract dirt and debris which is cosmetically unattractive. Also, if it is on a roof that may be walked on, it may become sticky or tacky under the sun, causing you to stick to it. Conversely, in cold, wet or snowy weather, it may become slippery, making it unsafe to walk on.

Can I use Through the Roof to seal or waterproof canvas?

Yes. Through the Roof brush grade can be used to seal tears in canvas. It may also work to water-proof canvas. To waterproof canvas, dilute with some solvent (say 1 part solvent to 5 parts Through the Roof) and apply. In cold weather, the canvas would get a bit on the stiff side but it would not affect performance. And again Sashco can't guarantee performance as we have not done any official testing on this application.

Can I use your chinking or caulking over an epoxy-based paint?

In general, yes. However, it can vary by brand. Allow 1 week dry time, and consider scuffing up the edges of the joint since most epoxies dry very hard, making adhesion more difficult. Scuffing up the edges of the joints will provide for stronger adhesion.

Can Lexel be used in a non-fish aquarium for animals such as lizards, gerbils, etc.?

No! Lexel can be toxic to animals of any kind because of the solvents in it.

Can Lexel be used in a swimming pool or hot tub?

Lexel is not a "marine" type sealant and is not recommended to be used in those areas, especially because we have not tested it with pool or hot tub chemicals, nor under water-submersion pressure . A "marine" type sealant or adhesive is recommended for those types of applications, as well as poly-sulfide or urethane sealants.

Can Lexel be used in an outdoor fish pond?

Yes. It must fully cure before putting in fish or other animals. This is okay because there is more "space" and larger volume of water into which the solvents can dissipate.

Can Lexel be used in food preparation areas or in a refrigerator or freezer?

Lexel is not FDA or USDA approved (and it has never been sought). For this reason, it is not recommended in food preparation areas. In refrigerators or freezers where approval is not needed, it will perform very well and hold up to the cold temperatures and can be cleaned with abrasive cleaners.

Can Lexel be used on a kayak? A boat?

Yes - below water line at your own risk since we haven't done the testing. We've had some very good feedback from customers on boats and kayaks, both above and below the waterline, with no significant difference between salt water and freshwater.

Can Lexel be used to repair a pond, a fountain, a bird bath, an aquarium, etc?

Depending on the exact application, it can be used to repair cracks or leaks in all of the above. Allow it to fully cure before putting animals in. Don't use in aquariums or enclosures with animals prone to chewing (gerbils, hamsters, rats, etc.) and only use in large aquariums (like outdoor ponds) in aquatic applications.

Can Lexel be used to seal drums with oil / gas / solvents inside?

No, not if they have any contact with the Lexel. Oil / gas / solvents will soften and dissolve the polymer in Lexel.

Can MildewFree be used as a glazing for windows?

No. Use a sealant specifically designed for window glazing or back bedding.

Can MildewFree be used in areas of submersion (i.e. a pond, pool, hot tub, aquarium, green house, bird bath, on boats and kayaks below water level)?

No, MildewFree is not designed for continuous submersion. It would be best to use a sealant approved for underwater use. Contact Customer Service for more guidance in these types of applications.

Can Mor-Flexx be used as a mortar or grout?

Mor-Flexx is not a mortar replacement or an actual grout. Mor-Flexx is designed to repair gaps or cracks in existing mortar. Actual mortar has load-carrying, structural ability, Mor-Flexx does not. Mor-Flexx is designed to seal cracks, not carry structural loads.

Can Mor-Flexx be used on a pool deck to repair cracks? Driveway? Sidewalk?

Mor-Flexx is not recommended for use on these horizontal surfaces. Caulk joints applied to pool decks, driveways, and sidewalks in particular are exposed to prolonged water submersion, the abrasion and abuse of high foot-traffic, and chemical exposure, to name a few. Instead, use Sashco's Slab, which is specifically designed to seal cracks in these areas

Can Mor-Flexx be used on expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Mor-Flexx to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Mor-Flexx in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Can you use Big Stretch on a mobile home or RV?

On a mobile home, yes. There are no substantial differences between mobile homes and conventional housing.

On an RV / motor homes, no. The non-porous materials often used & the type of direct movement and weather-exposure these vehicles experience often stress the Big Stretch too much. Lexel or Through The Roof would be better products to use for this application.

Does Big Stretch really stretch?

Yes! Big Stretch is super elastic and will twist, bend, stretch, or compress to absorb any movement a home can dish out. Big Stretch can span gaps up to 2" wide without cracking or losing adhesion.

Does Mor-Flexx adhere to rubber?

Yes, Mor-Flexx will adhere to rubber. It's a good idea to scuff up the rubber a bit where you want the Mor-Flexx to stick to provide for best adhesion.

Does Slab come in quart cartridges, 5 gallon pails, etc.?

Right now, Slab is available in 10.5 oz. standard caulking cartridges. However, please let us know if you'd like to see Slab in larger sizes. We're always happy to hear from our customers about their specific needs.

Does Slab contain a mildewcide?

Yes, Slab contains a pretty hefty dose of mildewcide to help prevent growth of mold and mildew on the surface of the caulk.

Does Through The Roof stick to most roofing materials?

Yes! Through The Roof will adhere to fiberglass / asphalt shingles, cedar shakes, plywood, water-based acrylic roof coatings, cement, slate and glazed tiles, asphalt roof cement, and many more. Refer to theThrough the Roof brochure for a more comprehensive list.

How can I remove Lexel?

Lexel is not very easy to remove (as you've probably discovered). Mineral spirits will do the trick. Apply some and allow it to sit, then use a scraper or razor blade to remove Lexel. Commonly available silicone removers based on mineral spirits will also do the trick and are often less messy. In particular, McKanica Silicone Caulk Remover works great.

How do I clean up Slab that is still wet?

Soap and water will do the trick. Easy!

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How does cross-linking improve MildewFree?

The cross-linking within the MildewFree formula will toughen the surface of the caulk so it can be routinely scrubbed to remove soap scum, dirt, and other residue. A cross-linked film also prevents the sealant from holding a lot of moisture, which can soften or damage the sealant over time.

How long can I store my mixed eXact color?

When sealed with the clear cap, mixed eXact color can be stored and used for 1 year after being mixed.

How long will Big Stretch last? Does it come with a warranty?

Big Stretch comes with a limited lifetime warranty. Refer to warranty details on our website, on product packaging or on the Big Stretch brochure.

How long will Lexel last? Does it come with a warranty?

Lexel comes with a limited lifetime warranty. Refer to warranty details on our website, on the product packaging or the Lexel brochure.

How long will MildewFree last? Does it come with a warranty?

MildewFree is one of a kind in the market. It comes with a 7 year warranty that includes labor should the product need to be re-installed, as well as Sashco's Limited Lifetime Warranty applicable to all our sealants. Refer to warranty details on the packaging or the MildewFree brochure.

How long will Through the Roof last? Does it come with a warranty?

Through the Roof comes with a limited lifetime warranty. Refer to warranty details Refer to warranty details on our website, on the product packaging or the Through the Roof brochure.

I applied MildewFree 2 days ago. When I turned my shower on, it started to run. Why?

There could be a number of issues going on, but most likely, the sealant hasn't had enough time to cure. The tube says 48 hours, but that's in ideal conditions. Especially if the humidity has been high and/or the temperature has been low, the MildewFree may not yet be cured enough to withstand direct moisture. Try giving it some more time to cure. Running a fan in the area will help speed curing, too.

I applied Slab today and it's supposed to rain tomorrow. Do I need to cover it?

Yes, it would be best to cover Slab if you expect rain within 24 hours of application. Simply cover with a tarp or something similar to keep rain off of it.

I applied Slab yesterday and it's still soft. How long will it take for it to dry? Can I drive or walk on it yet?

Dry time will depend on how much Slab was applied, the temperature and humidity. Larger beads will take longer to cure, and cooler and more humid conditions will also extend the cure time. In ideal temps and humidity (less than 50% humidity and 70

I caulked my tub a couple weeks ago. Now the caulk is splitting down the middle. What's happening?

If you're like most people, you probably caulked around your tub while it was empty, which means the joint wasn't at it widest. The caulk probably got stressed a little and split. Try filling the tub with water and re-caulking. No need to remove what's already in there - if it's split down the middle, the fix is just applying more. Filling the tub with water will ensure the joint is at it's widest and the caulk will stretch correctly.

I have tire tread marks on the Slab I just applied. How do I clean those off?

Soap and water should remove those tread marks from the Slab. You might need to use a nylon brush (the kind you use on dishes) to get at any stubborn spots.

I put Slab down on my driveway a few hours ago and didn't realize I'd need to get my car out of the garage. Now what?

Put some boards or plywood over the product and drive on that instead. Then be sure to avoid driving on it for at least 24 hours to allow it to cure.

I see that Slab has a cancer warning on the cartridge. Should I be concerned?

We use naturally occurring silica sand in Slab to give it texture (yes, the same sand you can find on the beach). A small portion of this sand has crystalline silica. It is the airborne, breathable portion of the crystalline silica that is considered a carcinogen. As long as you don't sand or grind the surface of the Slab material after it is cured without using proper respirator equipment, your exposure to any crystalline silica is less than it would be if you were to visit the beach.

I was a bit messy and got some Slab where I don't want it. Now it's dry. How do I remove it?

Try a citrus-based cleaner first. That should help loosen it up some. Then try scraping at it with a plastic scraper to loosen it more and pull it off. If that doesn't work, you can try mineral spirits to loosen it more.

Is Big Stretch FDA approved for use in areas of food preparation, refrigerators, freezers, etc.?

It would be ok in the freezer / refrigerator environment (where FDA or USDA approval is not required), as the service range is -30F degrees to 250F degrees. However, it should not be used outside of those areas, as Big Stretch is not FDA or USDA approved.

Is Big Stretch paintable?

Yes, Big Stretch is paintable within 4 hours with latex based paints, stains and primers and after 1 week with oil based paints, stains, and primers. Latex coatings are breathable and some are quite elastic, allowing the Big Stretch to continue to cure through it while maintaining a flexible film that won't crack.

Lower quality latex paints are seldom as elastic as Big Stretch and can crack while the caulk cures and shrinks. As such, it is best to let Big Stretch dry completely before painting with lower quality paints.

Some oil based products are not breathable, which can prevent the Big Stretch from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Big Stretch as it goes through its curing. Waiting the full week to cover with oil-based products helps ensure that cracking will not happen.

Is it okay if the product freezes in transit?

Yes. All of Sashco's products are freeze-thaw stable through 5 cycles. It is best to make sure the product is brought to room temperature prior to application to ensure proper thickness of the product.

Is Lexel a silicone?

No. Lexel is a co-polymer, or synthetic, rubber. It has no silicone rubber in it. Synthetic rubbers like Lexel are more durable, are extremely elastic and have UV inhibitors. Lexel can often times be used in areas where a silicone is recommended.

Is Lexel electrically conductive?

Lexel is better characterized as an insulator or dialectric. It does not conduct electricity. However, Sashco does not recommend Lexel being used for direct electrical applications.

Is Lexel fire safe?

No! It will burn

Is MildewFree a silicone?

No, MildewFree is not a silicone. It is an all acrylic sealant.

Is MildewFree paintable?

Yes, you can paint over MildewFree after 4 hours with most high quality water-based elastomeric paints. For best results, wait at least 24 hours (or longer in cool or humid conditions) before painting. Wait at least a week before painting with oil-based paints, which can stay tacky if the sealant is not fully cured.

Is Slab waterproof?

Once fully cured, yes. During early cure, be sure to protect it from heavy rains, as that could cause the product to washout.

Is there a way to prevent air bubbles in my eXact color when I mix it?

No. There will inevitably be some air bubbles that form when it is mixed.

Is Through The Roof easy to clean up?

Yes! Tools may be cleaned with mineral spirits or paint thinner. We recommend cleaning hands with a citrus-based or waterless hand cleansers.

Is Through The Roof Waterproof?

Yes! Through The Roof is waterproof

Is your chinking / caulking supposed to stay "soft"?

Yes. All of our chinking and caulking products are formulated to retain their elasticity (or "softness") for many years.

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

My dog just drank some of the water I used when chinking / caulking. What should I do?

Contact a local veterinary clinic as soon as possible. You dog will most likely be just fine, but it's best to contact a vet to get immediate care instructions.

On the average, what is the life expectancy of Through The Roof vs. asphalt?

In our testing, we've found Through the Roof to last at least 20 times longer. The testing is still going, so that is likely to go up.

Slab cracked! What happened, and how can I fix it?

If Slab cracked down the middle, that usually means either: a) the joint is now wider and it stressed the caulk too much or b) Slab may have been applied either too thin or too thick and isn't able to stretch properly. In either case, the fix is easy:

1. Use a razor blade to release any tension in the caulk. 2. Clean the joint with soap and water to remove dust, gravel, sand, etc. 3. Insert some of Sashco's Pre-Caulking Filler Rope (or similar), if some wasn't used before. 4. Apply more Slab over the filler rope, making sure it's sticking to the leftover product. Smooth the bead to ensure good adhesion.

If Slab is no longer sticking to the side of the joint, you'll need to cut it out and re-do it. That's usually caused by some sort of chemical that Slab won't stick to, or the substrate itself being weak. (This is common with asphalt or concrete that was poured in cold temps and wasn't able to properly cure itself.) It will help to sand down the sides of the joint with a wire brush to ensure any loose concrete is removed and the Slab will be sticking to a good, sound surface.

Slab is too dark for my concrete. What can I do to help it match better?

The color of Slab was chosen to match concrete that is aged and has darkened. If your concrete is newer, it may be darker than you need. Time will darken your concrete some so that Slab will eventually blend in. Until then, Slab is paintable. Feel free to paint over it with paints made specifically for concrete floors to get a better match.

The surface of my concrete is spalling. Can I use Slab to repair it?

No. Slab is not a good "glue" for spalling concrete. It would be best to remove the spalling or consider having a concrete contractor come out to fix it.

What are isocyanates? Why does it matter that Slab doesn't have them?

Isocyanates are highly toxic, both to breathe and to touch. Many concrete repair products contain them. Slab doesn't. So breathe easy, save the planet and fix your concrete cracks all at the same time.

What are the benefits of a co-polymer rubber formula like Lexel?

Depending on the type of polymers used, synthetic rubbers like Lexel are more durable, have high tensile strength and higher UV inhibitors. They also shrink more. The solvents in Lexel "clean" the surface for better adhesion and the additives in it soften it and make it more flexible and elastic.

What do you use to tool your chinking or caulking?

A variety of tools and techniques can be used

What is Big Stretch?

Big Stretch is a water-based acrylic latex sealant.

What is Lexel made of?

Lexel is a solvent-based co-polymer rubber sealant.

What is MildewFree?

MildewFree is a water-based all acrylic sealant that has been designed and tested to be resistant to mildew growth.

What is Slab?

Slab is a 100% water-based acrylic latex caulk for concrete crack repair. Unlike other concrete repair products, it's not sticky and difficult to apply, nor does it dry hard and crack. Slab combines excellent adhesion and superior elasticity to result in a concrete crack repair that lasts.

What is the best way to remove Big Stretch?

It is not always necessary to remove Big Stretch. The surface can often be cleaned and the joint re-caulked

What is the best way to remove MildewFree?

First, peel and scrape away as much material as possible. Be careful not to damage soft or brittle surfaces. Then, if you prefer, a solvent (caulk remover) can be used to soften the caulk film and make it easier to remove the residue. Make sure the chemical is approved for your surface to avoid damaging it. If you prefer not to use solvents, you may soften the residue with soap and water and continue to scrape or scrub with an abrasive cleaning pad until the surface is clean.

What is the proper depth (thickness) of a caulking or chinking line?

A general rule of thumb to follow when caulking is to make the joint half as deep as it is wide. This means on a 1 inch caulking line, the depth should be 1/2" deep (or thick).

The joint depth should never be thinner than 1/4" and never thicker than 1/2".

What is the shelf life of your products after they've been opened?

That will vary depending on how the product is stored and how old the product was when purchased. In general, you will get one more year out of an opened product when properly sealed and stored in moderate temps (between 50⁰ and 90⁰F).

Storage instructions:

For squeeze tubes and capped cartridges:
Clean out the nozzle and cover with the cap that came with the product.

For regular cartridges:
Clean out the nozzle as best you can, then cover tightly with plastic wrap. Tape around the plastic wrap, or wrap tightly with a rubberband.

For containers or buckets:
Cover tightly with the lid that came with the product.

What precautions should I take when using chemical cleaners or strippers?

It's always important to use proper safety equipment (skin, eye and respiratory equipment) when using chemicals. It is also important to be sure that any chemical used is thoroughly neutralized. If not neutralized, any residual chemical can cause unsound wood to form, which can then affect long-term performance of the products used on top of the wood.

It is best to talk to the company who has made the chemical to get their advice on how to neutralize it. And then, of course, follow up when finished with some pH strips, available at most paint stores. The wood surface should be close to neutral (7) before moving forward with application of any finishing products.

What product should I use if I have to use sulfamic acid to clean my walls (usually after tiling & grouting a shower wall)?

Lexel would be the best product to use. It is resistant to breakdown by sulfamic acid.

What solvents does Lexel have in it?

Download the product-specific MSDS for more information.

What solvents does Through the Roof have in it?

Refer to the MSDS for more information.

What type of warranty comes with your products?

The warranties for each product are included on their respective labels and accompanying literature.

What will Big Stretch adhere to?

Big Stretch will adhere to most construction materials. Refer to theBig Stretch brochure for a more comprehensive list.

What will happen if I don't wait for the Big Stretch to cure before painting over it with an oil-based paint?

As the Big Stretch continues to cure and shrink, the paint will most likely crack over top of the Big Stretch. It's also possible for the Big Stretch itself to crack if it has not undergone the majority of its curing, as the oil-based stain can interfere with Big Stretch's ability to form the proper film. So, all in all, it is just best to wait. If you can't, be prepared to do some re-painting in a few areas.

What will happen if it rains shortly after I have applied Through the Roof?

Through the Roof can actually be applied to wet surfaces and has been found to work immediately when applied during a rain storm. If it gets wet during or shortly after application, it will simply take a bit longer than normal to cure. It is NOT recommended for areas of continual submersion.

What's the difference between backer rod and Grip Strip?

Both are bond breakers, but backer rod is usually round and Grip Strip is trapezoid shaped.

When do you use MildewFree vs. using Sashco's Lexel or Big Stretch?

Big Stretch is not recommended for use in bathrooms or kitchens, where there might be routine exposure to water. MildewFree and Lexel can be used in bathrooms and kitchens, but there are significant differences. MildewFree is water-based, and Lexel is solvent-based, so you can clean up tools, hands, etc. with MildewFree on them with water. Lexel will require solvents to clean up. MildewFree is easier to tool than Lexel, and has a flatter sheen to it. In addition, the colors of MildewFree have been matched to common kitchen and bath colors, and should blend into the joint a little more than Lexel, which is only available in clear or a bright white color.

When I use eXact color, will the color be uniform throughout the cartridge?

Yes. If eXact color is mixed as directed (either by hand or in a mixing machine), the paint will be distributed evenly throughout the cartridge before the activator is added and mixed in. Once thickened by the activator, the color will be uniform throughout the cartridge.

Where should I store unmixed cartridges of eXact color?

It is best to store them in a cool (but not freezing), dry place. Storing in hot temperatures can cause the product to skin over, which will in turn affect mixing, final appearance and performance.

Where should I use Slab vs. Sashco's Mor-Flexx

Slab is specifically made for horizontal concrete, brick and stone surfaces. It's specifically formulated to withstand heavy foot and vehicle traffic. As part of that, Slab shrinks more than Mor-Flexx and is design to be recessed below the surface, which helps with durability. Mor-Flexx is ideal for vertical applications: walls, around your chimney, brick, stucco and the like. It comes in a wide variety of colors to match all of those different surfaces, but isn't tough enough to handle foot and vehicle traffic. Mor-Flexx doesn't shrink nearly as much as Slab, remaining flush with the surface, which is the ideal aesthetic for a vertical surface where you need the repair to blend in.

Which paints are best to use with Big Stretch?

Most any latex paint will be compatible with Big Stretch. However, be aware that some of the lower-end flat latex paints may crack over Big Stretch. Why? Low-end flat latex paints are full of solids and fillers that are not flexible. The Big Stretch will stretch with movement but the paint will not, causing the paint to crack over the surface of the caulk. Higher-end latex paints do not exhibit this problem as much.

Why do I have to fill checks and cracks?

Checks allow moisture and wood-destroying fungi to find their way deep into the interior of wood. When fungi have a food source (the wood), moisture, oxygen and the right temperature, they can lead to rot, which, in some cases, can negatively affect the structural integrity of the home. And it can be very costly to fix rot. Filling in those checks and cracks will save you money and stress down the line.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.

Why does Big Stretch clear look white?

When Big Stretch® clear is first applied, it has a milky white appearance. Not to worry, though - as it dries, it turns clear.

Why doesn't the color of the eXact color match my paint when it comes out of the tube?

Don't worry! As the product dries, it will be an eXact color match. But out of the tube, it may look a little lighter in color.

Why is my paint cracking over the Big Stretch I applied? What can I do about it?

Most likely this is due to Big Stretch not being fully cured before the paint was applied. Lower-quality flat paints are especially susceptible to cracking since they are chock-full of fillers that make them rigid, but humid weather and abnormal movement can cause this at times, as well.

To fix this, first allow the Big Stretch to cure completely. (This can take anywhere from 4 days to 2 weeks, depending on temp and humidity). Follow with a new coat of primer and another coat of the same paint. It should blend in with no problems.

Why should I use water- based products?

Certainly, water-based products are not mandatory, and there are some solvent-based products that perform well. Water-based products are generally much easier to apply and clean up, and they pose less risk to your health, the environment and are a lower fire hazard. The environmental movement of the last several years has driven considerable innovation in the chemistry of water-based coatings and sealants and these products are now offering excellent levels of performance that would have been difficult just a few years ago.

Will Big Stretch adhere to Protecto wrap?

No. The backing of Protecto wrap is polyethylene. It will work great as a bond breaker. Also, Big Stretch will not attack the bitumen/butyl adhesive of these kinds of self-adhering flashing materials.

Will Big Stretch help sound proof my home?

Sealing up cracks and cavities – like where the drywall meets the floor, around windows & doors, around electrical boxes, etc. – will always help reduce sound transmission in a home.  In addition, if a bead of Big Stretch is put on the wall studs prior to drywall installation, this can help further dampen sound transmission, as the sound waves will be bouncing off a much more elastic & soft material (the Big Stretch), rather than the hard stud wood.

Will Lexel adhere well to cured concrete that has gotten wet?

Yes, but some problems may surface. Since concrete is porous, the Lexel may have a hard time maintaining adhesion. As the sun comes out and heats up the moisture in the concrete, it will try to escape and may stress the Lexel to the point of failure. Also, many concrete form release agents contain silicones, waxes, etc. that can interfere with Lexel adhesion

Will Lexel help prevent air leaks in my home?

Yes! Lexel keeps the weather outside. It seals thresholds, sills, siding, vents, pipes and air conditioners. Lexel is also good for leaky air ducts which can heat up your walls instead of your living area. Use Lexel to permanently seal all connections.

Will Lexel prevent radon gas infiltration?

With radon gas, it is best to set up a proper ventilation system to direct the gas outdoors. Lexel can temporarily keep radon gas from getting to the interior of the home; however, eventually the gas can diffuse through any sealant (including Lexel), requiring ventilation.

Will Lexel stay clear looking?

Yes! Lexel will always remain ultra-clear. Plus, Lexel seals beautifully while resisting mildew and dust collection. Once cured, it can withstand scrubbing with abrasive household cleaners.

Will my paint become shiny wherever I have applied it over Big Stretch?

NO. While many water-based latex sealants will "flash" (be shiny) under paint, Big Stretch will not. This means that your flat paint will indeed look flat, or your semi-gloss look semi-gloss instead of glossy over top of Big Stretch.

Will the gloss or sheen of eXact color match that of my paint?

With semi-gloss or gloss paints the match will be very close. With flat or eggshell sheens the eXact color will be a little glossier.
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Caulking and Chinking tools

Can I use anything other than backer rod or Grip Strip as a bond breaker?

Yes! Clear packing tape (or any other kind of mylar tape) is also a common form of a bond breaker. If you are already at the desired depth, just place a piece of tape over the back of the joint and apply your caulking or chinking. You can also use duct tape or polyethylene tape (like Poly Masking Tape).

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

What do you use to tool your chinking or caulking?

A variety of tools and techniques can be used

What's the difference between backer rod and Grip Strip?

Both are bond breakers, but backer rod is usually round and Grip Strip is trapezoid shaped.

Why do I have to fill checks and cracks?

Checks allow moisture and wood-destroying fungi to find their way deep into the interior of wood. When fungi have a food source (the wood), moisture, oxygen and the right temperature, they can lead to rot, which, in some cases, can negatively affect the structural integrity of the home. And it can be very costly to fix rot. Filling in those checks and cracks will save you money and stress down the line.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.
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caulkng

How long will Mor-Flexx last? Does it come with a warranty?

Mor-Flexx comes with a limited lifetime warranty. Refer to warranty details on the packaging or on the Mor-Flexx Brochure.

What is the shelf life of your products after they've been opened?

That will vary depending on how the product is stored and how old the product was when purchased. In general, you will get one more year out of an opened product when properly sealed and stored in moderate temps (between 50⁰ and 90⁰F).

Storage instructions:

For squeeze tubes and capped cartridges:
Clean out the nozzle and cover with the cap that came with the product.

For regular cartridges:
Clean out the nozzle as best you can, then cover tightly with plastic wrap. Tape around the plastic wrap, or wrap tightly with a rubberband.

For containers or buckets:
Cover tightly with the lid that came with the product.

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Conceal

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I use Conceal on the interior of my home?

Yes! Be sure to follow all proper application instructions as outlined in the Conceal info sheet.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

Is your chinking / caulking supposed to stay "soft"?

Yes. All of our chinking and caulking products are formulated to retain their elasticity (or "softness") for many years.

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

Why do I have to fill checks and cracks?

Checks allow moisture and wood-destroying fungi to find their way deep into the interior of wood. When fungi have a food source (the wood), moisture, oxygen and the right temperature, they can lead to rot, which, in some cases, can negatively affect the structural integrity of the home. And it can be very costly to fix rot. Filling in those checks and cracks will save you money and stress down the line.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.
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Concrete & Masonry

Are there products other than McKanica® to use in removing silicone?

There are several brands on the market. We have tested a few of them, and the McKanica® formula stood out as the best to remove a variety of silicone residues from the surface. If you cannot find the McKanica® product, try to find a caulk remover that contains both alcohol and a solvent such as mineral spirits. The combination of alcohol and solvents is more potent and effective.

Are your products compatible with other products?

Contact Customer Service at 1-800-767-5656. They can give you general information on chemical compatibility between Sashco's products and others.

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I use any of your products with asphalt?

All of our sealant products will adhere well to asphalt; however, be aware that asphalt does not have much internal strength itself and, as such, readily fails on its own under stress. Repairs and regular maintenance will most likely be required wherever there is asphalt.

Can I use Big Stretch to seal cracks or expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Big Stretch to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Big Stretch in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Can I use Lexel to fill cracks in my driveway?

Sashco's Slab is the better choice and is made specifically to withstand high foot and vehicle traffic. Lexel tends to be too soft for these types of applications.

Can I use Mor-Flexx around my fireplace?

Yes, as long as the Mor-Flexx and the stone / brick it's sticking to won't get hotter than 250 degrees F (121 degrees C).

Can I use Slab in areas of hydrostatic pressure?

No. That's not a great application for Slab. It has not been tested for those conditions and is not resistant to such pressures.

Can I use Slab in concrete expansion joints?

Yes. Slab will adhere well and perform well. Just be aware that expansion joints do just that

Can I use Slab on asphalt?

Yes, Slab will adhere well to asphalt; however, be aware that asphalt is an inherently weak material. It tends to crumble and lose adhesion to itself over time. Slab will stick around for the long haul, but you may find some asphalt stuck to the back of the caulk when the asphalt cracks.

Can Mor-Flexx be used as a mortar or grout?

Mor-Flexx is not a mortar replacement or an actual grout. Mor-Flexx is designed to repair gaps or cracks in existing mortar. Actual mortar has load-carrying, structural ability, Mor-Flexx does not. Mor-Flexx is designed to seal cracks, not carry structural loads.

Can Mor-Flexx be used on a pool deck to repair cracks? Driveway? Sidewalk?

Mor-Flexx is not recommended for use on these horizontal surfaces. Caulk joints applied to pool decks, driveways, and sidewalks in particular are exposed to prolonged water submersion, the abrasion and abuse of high foot-traffic, and chemical exposure, to name a few. Instead, use Sashco's Slab, which is specifically designed to seal cracks in these areas

Can Mor-Flexx be used on expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Mor-Flexx to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Mor-Flexx in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

I applied Slab today and it's supposed to rain tomorrow. Do I need to cover it?

Yes, it would be best to cover Slab if you expect rain within 24 hours of application. Simply cover with a tarp or something similar to keep rain off of it.

I applied Slab yesterday and it's still soft. How long will it take for it to dry? Can I drive or walk on it yet?

Dry time will depend on how much Slab was applied, the temperature and humidity. Larger beads will take longer to cure, and cooler and more humid conditions will also extend the cure time. In ideal temps and humidity (less than 50% humidity and 70

I put Slab down on my driveway a few hours ago and didn't realize I'd need to get my car out of the garage. Now what?

Put some boards or plywood over the product and drive on that instead. Then be sure to avoid driving on it for at least 24 hours to allow it to cure.

Is Slab waterproof?

Once fully cured, yes. During early cure, be sure to protect it from heavy rains, as that could cause the product to washout.

Slab cracked! What happened, and how can I fix it?

If Slab cracked down the middle, that usually means either: a) the joint is now wider and it stressed the caulk too much or b) Slab may have been applied either too thin or too thick and isn't able to stretch properly. In either case, the fix is easy:

1. Use a razor blade to release any tension in the caulk. 2. Clean the joint with soap and water to remove dust, gravel, sand, etc. 3. Insert some of Sashco's Pre-Caulking Filler Rope (or similar), if some wasn't used before. 4. Apply more Slab over the filler rope, making sure it's sticking to the leftover product. Smooth the bead to ensure good adhesion.

If Slab is no longer sticking to the side of the joint, you'll need to cut it out and re-do it. That's usually caused by some sort of chemical that Slab won't stick to, or the substrate itself being weak. (This is common with asphalt or concrete that was poured in cold temps and wasn't able to properly cure itself.) It will help to sand down the sides of the joint with a wire brush to ensure any loose concrete is removed and the Slab will be sticking to a good, sound surface.

Slab is too dark for my concrete. What can I do to help it match better?

The color of Slab was chosen to match concrete that is aged and has darkened. If your concrete is newer, it may be darker than you need. Time will darken your concrete some so that Slab will eventually blend in. Until then, Slab is paintable. Feel free to paint over it with paints made specifically for concrete floors to get a better match.

The surface of my concrete is spalling. Can I use Slab to repair it?

No. Slab is not a good "glue" for spalling concrete. It would be best to remove the spalling or consider having a concrete contractor come out to fix it.

Where should I use Slab vs. Sashco's Mor-Flexx

Slab is specifically made for horizontal concrete, brick and stone surfaces. It's specifically formulated to withstand heavy foot and vehicle traffic. As part of that, Slab shrinks more than Mor-Flexx and is design to be recessed below the surface, which helps with durability. Mor-Flexx is ideal for vertical applications: walls, around your chimney, brick, stucco and the like. It comes in a wide variety of colors to match all of those different surfaces, but isn't tough enough to handle foot and vehicle traffic. Mor-Flexx doesn't shrink nearly as much as Slab, remaining flush with the surface, which is the ideal aesthetic for a vertical surface where you need the repair to blend in.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.

Will Lexel adhere well to cured concrete that has gotten wet?

Yes, but some problems may surface. Since concrete is porous, the Lexel may have a hard time maintaining adhesion. As the sun comes out and heats up the moisture in the concrete, it will try to escape and may stress the Lexel to the point of failure. Also, many concrete form release agents contain silicones, waxes, etc. that can interfere with Lexel adhesion
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Custom Colored Caulk

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.
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eXact color

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I use an oil-based paint with eXact color?

No. Several bad things can happen, depending on the oil-based paint's formula:
- It won't mix in properly, like oil-in-water, and give uneven coloring
- It can cause the Exact Color to de-stabilize and congeal
- It can lead to the finished caulk being sticky when it dries
- It can lead to the dried caulk having poor performance and poor endurance

Can I use any color latex paint in eXact color?

YES! You can get an exact match to your paint when you mix it with eXact color.

Can I use eXact color for exterior applications?

Yes. eXact color is exellent for both interior and exterior applications.

Can I use simple universal pigments in eXact color, instead of paint?

Yes, when mixed by experienced professionals. Contact Sashco for detailed guidance if you desire to use universal pigments instead of paint. Of course, it's best to simply use your color paint to ensure an eXact color match every time.

Can I use the dispensing nozzle instead of the threaded cap to mix my eXact color?

No. It might work OK for mixing the paint in, but it will not work when the activator is mixed into the colored base. Be sure to follow the given directions to ensure proper mixing and application.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How long can I store my mixed eXact color?

When sealed with the clear cap, mixed eXact color can be stored and used for 1 year after being mixed.

Is there a way to prevent air bubbles in my eXact color when I mix it?

No. There will inevitably be some air bubbles that form when it is mixed.

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

When I use eXact color, will the color be uniform throughout the cartridge?

Yes. If eXact color is mixed as directed (either by hand or in a mixing machine), the paint will be distributed evenly throughout the cartridge before the activator is added and mixed in. Once thickened by the activator, the color will be uniform throughout the cartridge.

Where should I store unmixed cartridges of eXact color?

It is best to store them in a cool (but not freezing), dry place. Storing in hot temperatures can cause the product to skin over, which will in turn affect mixing, final appearance and performance.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.

Why doesn't the color of the eXact color match my paint when it comes out of the tube?

Don't worry! As the product dries, it will be an eXact color match. But out of the tube, it may look a little lighter in color.

Will the gloss or sheen of eXact color match that of my paint?

With semi-gloss or gloss paints the match will be very close. With flat or eggshell sheens the eXact color will be a little glossier.
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Kitchen

Are there products other than McKanica® to use in removing silicone?

There are several brands on the market. We have tested a few of them, and the McKanica® formula stood out as the best to remove a variety of silicone residues from the surface. If you cannot find the McKanica® product, try to find a caulk remover that contains both alcohol and a solvent such as mineral spirits. The combination of alcohol and solvents is more potent and effective.

Are your products compatible with other products?

Contact Customer Service at 1-800-767-5656. They can give you general information on chemical compatibility between Sashco's products and others.

Can I use Lexel on the molding around my wood floors?

Yes! Clear Lexel may be used where you desire the surfaces to show through. This is especially helpful when natural woods are sealed, such as around molding or wood floors.

Can I use Lexel to help with wallpapering?

Yes! Lexel used over wallpaper edges prevents curling and is an excellent use of its ultra-clear formula.

Can I use MildewFree to adhere tile? How many?

Yes, but only small tiles (8" or less) and only for replacing broken tiles.

Can I use MildewFree to repair grout? What size?

Yes, if you like the way the product looks, and with grout lines less than 1/4" wide. There are better options if you have textured grout or large grout joints.

Can Lexel be used in food preparation areas or in a refrigerator or freezer?

Lexel is not FDA or USDA approved (and it has never been sought). For this reason, it is not recommended in food preparation areas. In refrigerators or freezers where approval is not needed, it will perform very well and hold up to the cold temperatures and can be cleaned with abrasive cleaners.

Can Mor-Flexx be used as a mortar or grout?

Mor-Flexx is not a mortar replacement or an actual grout. Mor-Flexx is designed to repair gaps or cracks in existing mortar. Actual mortar has load-carrying, structural ability, Mor-Flexx does not. Mor-Flexx is designed to seal cracks, not carry structural loads.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

I applied MildewFree 2 days ago. When I turned my shower on, it started to run. Why?

There could be a number of issues going on, but most likely, the sealant hasn't had enough time to cure. The tube says 48 hours, but that's in ideal conditions. Especially if the humidity has been high and/or the temperature has been low, the MildewFree may not yet be cured enough to withstand direct moisture. Try giving it some more time to cure. Running a fan in the area will help speed curing, too.

Is Big Stretch FDA approved for use in areas of food preparation, refrigerators, freezers, etc.?

It would be ok in the freezer / refrigerator environment (where FDA or USDA approval is not required), as the service range is -30F degrees to 250F degrees. However, it should not be used outside of those areas, as Big Stretch is not FDA or USDA approved.

Is Big Stretch paintable?

Yes, Big Stretch is paintable within 4 hours with latex based paints, stains and primers and after 1 week with oil based paints, stains, and primers. Latex coatings are breathable and some are quite elastic, allowing the Big Stretch to continue to cure through it while maintaining a flexible film that won't crack.

Lower quality latex paints are seldom as elastic as Big Stretch and can crack while the caulk cures and shrinks. As such, it is best to let Big Stretch dry completely before painting with lower quality paints.

Some oil based products are not breathable, which can prevent the Big Stretch from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Big Stretch as it goes through its curing. Waiting the full week to cover with oil-based products helps ensure that cracking will not happen.

What product should I use if I have to use sulfamic acid to clean my walls (usually after tiling & grouting a shower wall)?

Lexel would be the best product to use. It is resistant to breakdown by sulfamic acid.

When do you use MildewFree vs. using Sashco's Lexel or Big Stretch?

Big Stretch is not recommended for use in bathrooms or kitchens, where there might be routine exposure to water. MildewFree and Lexel can be used in bathrooms and kitchens, but there are significant differences. MildewFree is water-based, and Lexel is solvent-based, so you can clean up tools, hands, etc. with MildewFree on them with water. Lexel will require solvents to clean up. MildewFree is easier to tool than Lexel, and has a flatter sheen to it. In addition, the colors of MildewFree have been matched to common kitchen and bath colors, and should blend into the joint a little more than Lexel, which is only available in clear or a bright white color.
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Lexel

Can Big Stretch be used around a hot tub or in a sauna, or in greenhouse?

No. A better choice in some of these areas is Sashco's Lexel. There is too much humidity, heat, condensation, etc. that can affect both the proper curing and performance of most water-based caulks, including Big Stretch.

Can Big Stretch be used in my shower?

No, it would be best to use Lexel or MildewFree for these types of applications. Big Stretch can be used for other applications in the bathroom, such as base boards, crown molding, and sealing between the tub and floor.

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I paint Lexel?

Yes, Lexel is paintable with latex paints after 24-48 hours and after 7 days with oil based paints (longer with larger beads, or in cooler and/or humid conditions). Latex products are breathable and elastic, allowing the Lexel to continue to cure through it while maintaining a flexible film that won't crack. Some oil based products are not breathable, which can prevent the Lexel from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Lexel as it goes through its curing. Waiting for the Lexel to completely cure before painting over it with oil-based products is best and will help minimize any cracking paint.

Can I use Lexel in my bathroom?

Yes! Lexel is ideal for this application! Practice tooling the bead before applying since it skins over quickly

Can I use Lexel in my greenhouse or sauna (areas of high humidity / moisture)?

Yes. The smell of the solvents during early cure can sometimes be bothersome, so be sure to let it cure first before using the sauna.

Can I use Lexel on my camper/RV?

Lexel® is highly recommended for most surfaces on RV's/ Campers. It can be used on rubber roof membranes; however, while it will adhere as usual to the rubber membrane, it may tend to ripple or warp the rubber membranes. Cosmetically, it may not look good, but the performance of both the Lexel® and the roof remain the same. That said, it's a good idea to test the Lexel® first to ensure the aesthetic issues are OK. In addition, some RV's / Campers use polyethylene and polypropylene materials. Lexel® will not stick to them, so keep your eye out.

Can I use Lexel on the molding around my wood floors?

Yes! Clear Lexel may be used where you desire the surfaces to show through. This is especially helpful when natural woods are sealed, such as around molding or wood floors.

Can I use Lexel to adhere a mirror to the wall?

No. A mirror adhesive or mirror mastic is recommended. Some silver backings of mirrors can be affected by the solvents in Lexel and can lead to a "ghosting" image in the mirror wherever the Lexel is applied. In addition, the backing materials on mirrors are not always adequate for good adhesion. The backing can pull or tear away from the glass and stick to the wall, while the mirror falls to the ground. And who needs 7 years of bad luck?

Can I use Lexel to fill cracks in my driveway?

Sashco's Slab is the better choice and is made specifically to withstand high foot and vehicle traffic. Lexel tends to be too soft for these types of applications.

Can I use Lexel to help with wallpapering?

Yes! Lexel used over wallpaper edges prevents curling and is an excellent use of its ultra-clear formula.

Can Lexel be used in a non-fish aquarium for animals such as lizards, gerbils, etc.?

No! Lexel can be toxic to animals of any kind because of the solvents in it.

Can Lexel be used in a swimming pool or hot tub?

Lexel is not a "marine" type sealant and is not recommended to be used in those areas, especially because we have not tested it with pool or hot tub chemicals, nor under water-submersion pressure . A "marine" type sealant or adhesive is recommended for those types of applications, as well as poly-sulfide or urethane sealants.

Can Lexel be used in an outdoor fish pond?

Yes. It must fully cure before putting in fish or other animals. This is okay because there is more "space" and larger volume of water into which the solvents can dissipate.

Can Lexel be used in food preparation areas or in a refrigerator or freezer?

Lexel is not FDA or USDA approved (and it has never been sought). For this reason, it is not recommended in food preparation areas. In refrigerators or freezers where approval is not needed, it will perform very well and hold up to the cold temperatures and can be cleaned with abrasive cleaners.

Can Lexel be used on a kayak? A boat?

Yes - below water line at your own risk since we haven't done the testing. We've had some very good feedback from customers on boats and kayaks, both above and below the waterline, with no significant difference between salt water and freshwater.

Can Lexel be used to repair a pond, a fountain, a bird bath, an aquarium, etc?

Depending on the exact application, it can be used to repair cracks or leaks in all of the above. Allow it to fully cure before putting animals in. Don't use in aquariums or enclosures with animals prone to chewing (gerbils, hamsters, rats, etc.) and only use in large aquariums (like outdoor ponds) in aquatic applications.

Can Lexel be used to seal drums with oil / gas / solvents inside?

No, not if they have any contact with the Lexel. Oil / gas / solvents will soften and dissolve the polymer in Lexel.

Can you use Big Stretch on a mobile home or RV?

On a mobile home, yes. There are no substantial differences between mobile homes and conventional housing.

On an RV / motor homes, no. The non-porous materials often used & the type of direct movement and weather-exposure these vehicles experience often stress the Big Stretch too much. Lexel or Through The Roof would be better products to use for this application.

How can I remove Lexel?

Lexel is not very easy to remove (as you've probably discovered). Mineral spirits will do the trick. Apply some and allow it to sit, then use a scraper or razor blade to remove Lexel. Commonly available silicone removers based on mineral spirits will also do the trick and are often less messy. In particular, McKanica Silicone Caulk Remover works great.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How long will Lexel last? Does it come with a warranty?

Lexel comes with a limited lifetime warranty. Refer to warranty details on our website, on the product packaging or the Lexel brochure.

Is Lexel a silicone?

No. Lexel is a co-polymer, or synthetic, rubber. It has no silicone rubber in it. Synthetic rubbers like Lexel are more durable, are extremely elastic and have UV inhibitors. Lexel can often times be used in areas where a silicone is recommended.

Is Lexel electrically conductive?

Lexel is better characterized as an insulator or dialectric. It does not conduct electricity. However, Sashco does not recommend Lexel being used for direct electrical applications.

Is Lexel fire safe?

No! It will burn

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

What are the benefits of a co-polymer rubber formula like Lexel?

Depending on the type of polymers used, synthetic rubbers like Lexel are more durable, have high tensile strength and higher UV inhibitors. They also shrink more. The solvents in Lexel "clean" the surface for better adhesion and the additives in it soften it and make it more flexible and elastic.

What is Lexel made of?

Lexel is a solvent-based co-polymer rubber sealant.

What product should I use if I have to use sulfamic acid to clean my walls (usually after tiling & grouting a shower wall)?

Lexel would be the best product to use. It is resistant to breakdown by sulfamic acid.

What solvents does Lexel have in it?

Download the product-specific MSDS for more information.

When do you use MildewFree vs. using Sashco's Lexel or Big Stretch?

Big Stretch is not recommended for use in bathrooms or kitchens, where there might be routine exposure to water. MildewFree and Lexel can be used in bathrooms and kitchens, but there are significant differences. MildewFree is water-based, and Lexel is solvent-based, so you can clean up tools, hands, etc. with MildewFree on them with water. Lexel will require solvents to clean up. MildewFree is easier to tool than Lexel, and has a flatter sheen to it. In addition, the colors of MildewFree have been matched to common kitchen and bath colors, and should blend into the joint a little more than Lexel, which is only available in clear or a bright white color.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.

Will Lexel adhere well to cured concrete that has gotten wet?

Yes, but some problems may surface. Since concrete is porous, the Lexel may have a hard time maintaining adhesion. As the sun comes out and heats up the moisture in the concrete, it will try to escape and may stress the Lexel to the point of failure. Also, many concrete form release agents contain silicones, waxes, etc. that can interfere with Lexel adhesion

Will Lexel help prevent air leaks in my home?

Yes! Lexel keeps the weather outside. It seals thresholds, sills, siding, vents, pipes and air conditioners. Lexel is also good for leaky air ducts which can heat up your walls instead of your living area. Use Lexel to permanently seal all connections.

Will Lexel prevent radon gas infiltration?

With radon gas, it is best to set up a proper ventilation system to direct the gas outdoors. Lexel can temporarily keep radon gas from getting to the interior of the home; however, eventually the gas can diffuse through any sealant (including Lexel), requiring ventilation.

Will Lexel stay clear looking?

Yes! Lexel will always remain ultra-clear. Plus, Lexel seals beautifully while resisting mildew and dust collection. Once cured, it can withstand scrubbing with abrasive household cleaners.
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Log Home

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I use Conceal on the interior of my home?

Yes! Be sure to follow all proper application instructions as outlined in the Conceal info sheet.

Can I use Jomax house cleaner prior to using your products?

Jomax is an acetic acid so will be fine to use prior to applying any Sashco products. Obviously, it will need to be thoroughly neutralized prior to applying any finishing products (ours or anyone else's).

How do I get rid of flies?

The only way to eliminate severe fly infestations is by locating their entry points into your home. If you don't eliminate these "highways," each year you can expect the same problem. Contact Customer Service for a referral to someone who can perform a thermographic survey on your home. This type of survey can help pin-point where these pests are entering your home.

How do I know the chemical cleaner /stripper I used is neutralized?

Get a hold of pH strips to test. Test the surface before applying the chemical and afterwards. The surface should come back to where it was or close to 7 (neutral). pH strips can be easily obtained at most paint stores, pool supply stores or from online retailers. You might even be able to get a few from your kid's science teacher.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How many people does it take to run a Kernel?

It only takes one person to run the machine at a time, but, since it is physically demanding to handle a long hose under pressure, it is a good idea to have a couple of people on hand to take turns operating the machine and keeping the pot full of media.

What can I use to blend the lap marks?

When lap marks occur, it is often impossible to completely eliminate them. The best that can be done is to either "feather" them into the adjoining regions with a relatively dry brush or by expertly "fogging" the area with an airless sprayer. In both cases, a little practice will be necessary to get the right look.

Why do I have to fill checks and cracks?

Checks allow moisture and wood-destroying fungi to find their way deep into the interior of wood. When fungi have a food source (the wood), moisture, oxygen and the right temperature, they can lead to rot, which, in some cases, can negatively affect the structural integrity of the home. And it can be very costly to fix rot. Filling in those checks and cracks will save you money and stress down the line.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.
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MildewFree

Can Big Stretch be used in my shower?

No, it would be best to use Lexel or MildewFree for these types of applications. Big Stretch can be used for other applications in the bathroom, such as base boards, crown molding, and sealing between the tub and floor.

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I use MildewFree to adhere a mirror to a wall?

No. MildewFree is not designed to hold a significant amount of weight to a wall. Use a mirror adhesive.

Can I use MildewFree to adhere tile? How many?

Yes, but only small tiles (8" or less) and only for replacing broken tiles.

Can I use MildewFree to repair grout? What size?

Yes, if you like the way the product looks, and with grout lines less than 1/4" wide. There are better options if you have textured grout or large grout joints.

Can MildewFree be used as a glazing for windows?

No. Use a sealant specifically designed for window glazing or back bedding.

Can MildewFree be used in areas of submersion (i.e. a pond, pool, hot tub, aquarium, green house, bird bath, on boats and kayaks below water level)?

No, MildewFree is not designed for continuous submersion. It would be best to use a sealant approved for underwater use. Contact Customer Service for more guidance in these types of applications.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How does cross-linking improve MildewFree?

The cross-linking within the MildewFree formula will toughen the surface of the caulk so it can be routinely scrubbed to remove soap scum, dirt, and other residue. A cross-linked film also prevents the sealant from holding a lot of moisture, which can soften or damage the sealant over time.

How long will MildewFree last? Does it come with a warranty?

MildewFree is one of a kind in the market. It comes with a 7 year warranty that includes labor should the product need to be re-installed, as well as Sashco's Limited Lifetime Warranty applicable to all our sealants. Refer to warranty details on the packaging or the MildewFree brochure.

I applied MildewFree 2 days ago. When I turned my shower on, it started to run. Why?

There could be a number of issues going on, but most likely, the sealant hasn't had enough time to cure. The tube says 48 hours, but that's in ideal conditions. Especially if the humidity has been high and/or the temperature has been low, the MildewFree may not yet be cured enough to withstand direct moisture. Try giving it some more time to cure. Running a fan in the area will help speed curing, too.

Is MildewFree a silicone?

No, MildewFree is not a silicone. It is an all acrylic sealant.

Is MildewFree paintable?

Yes, you can paint over MildewFree after 4 hours with most high quality water-based elastomeric paints. For best results, wait at least 24 hours (or longer in cool or humid conditions) before painting. Wait at least a week before painting with oil-based paints, which can stay tacky if the sealant is not fully cured.

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

What is MildewFree?

MildewFree is a water-based all acrylic sealant that has been designed and tested to be resistant to mildew growth.

What is the best way to remove MildewFree?

First, peel and scrape away as much material as possible. Be careful not to damage soft or brittle surfaces. Then, if you prefer, a solvent (caulk remover) can be used to soften the caulk film and make it easier to remove the residue. Make sure the chemical is approved for your surface to avoid damaging it. If you prefer not to use solvents, you may soften the residue with soap and water and continue to scrape or scrub with an abrasive cleaning pad until the surface is clean.

When do you use MildewFree vs. using Sashco's Lexel or Big Stretch?

Big Stretch is not recommended for use in bathrooms or kitchens, where there might be routine exposure to water. MildewFree and Lexel can be used in bathrooms and kitchens, but there are significant differences. MildewFree is water-based, and Lexel is solvent-based, so you can clean up tools, hands, etc. with MildewFree on them with water. Lexel will require solvents to clean up. MildewFree is easier to tool than Lexel, and has a flatter sheen to it. In addition, the colors of MildewFree have been matched to common kitchen and bath colors, and should blend into the joint a little more than Lexel, which is only available in clear or a bright white color.
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Mor-Flexx

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I use Mor-Flexx around my fireplace?

Yes, as long as the Mor-Flexx and the stone / brick it's sticking to won't get hotter than 250 degrees F (121 degrees C).

Can Mor-Flexx be used as a mortar or grout?

Mor-Flexx is not a mortar replacement or an actual grout. Mor-Flexx is designed to repair gaps or cracks in existing mortar. Actual mortar has load-carrying, structural ability, Mor-Flexx does not. Mor-Flexx is designed to seal cracks, not carry structural loads.

Can Mor-Flexx be used on a pool deck to repair cracks? Driveway? Sidewalk?

Mor-Flexx is not recommended for use on these horizontal surfaces. Caulk joints applied to pool decks, driveways, and sidewalks in particular are exposed to prolonged water submersion, the abrasion and abuse of high foot-traffic, and chemical exposure, to name a few. Instead, use Sashco's Slab, which is specifically designed to seal cracks in these areas

Can Mor-Flexx be used on expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Mor-Flexx to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Mor-Flexx in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Does Mor-Flexx adhere to rubber?

Yes, Mor-Flexx will adhere to rubber. It's a good idea to scuff up the rubber a bit where you want the Mor-Flexx to stick to provide for best adhesion.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How long will Mor-Flexx last? Does it come with a warranty?

Mor-Flexx comes with a limited lifetime warranty. Refer to warranty details on the packaging or on the Mor-Flexx Brochure.

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

Where should I use Slab vs. Sashco's Mor-Flexx

Slab is specifically made for horizontal concrete, brick and stone surfaces. It's specifically formulated to withstand heavy foot and vehicle traffic. As part of that, Slab shrinks more than Mor-Flexx and is design to be recessed below the surface, which helps with durability. Mor-Flexx is ideal for vertical applications: walls, around your chimney, brick, stucco and the like. It comes in a wide variety of colors to match all of those different surfaces, but isn't tough enough to handle foot and vehicle traffic. Mor-Flexx doesn't shrink nearly as much as Slab, remaining flush with the surface, which is the ideal aesthetic for a vertical surface where you need the repair to blend in.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.
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Product

Can Big Stretch be used around a hot tub or in a sauna, or in greenhouse?

No. A better choice in some of these areas is Sashco's Lexel. There is too much humidity, heat, condensation, etc. that can affect both the proper curing and performance of most water-based caulks, including Big Stretch.

Can Big Stretch be used as a crack filler or nail hole filler?

Yes, but Big Stretch shrinks quite a bit and could result in a "concave" hole which would need to have more caulk applied. Putty or spackling paste would be more efficient.

Can Big Stretch be used as a glazing on windows?

A soft gooey "sticky" sealer such as a butyl caulk is needed for back bedding. We do not recommend any of our products be used as glazing or as a back-bedding.

Can Big Stretch be used in my shower?

No, it would be best to use Lexel or MildewFree for these types of applications. Big Stretch can be used for other applications in the bathroom, such as base boards, crown molding, and sealing between the tub and floor.

Can Big Stretch be used on roof applications?

No. There is too much direct and extreme weather exposure. We recommend Sashco's Through the ROOF! instead.

Can I apply Big Stretch over an oil-based primer?

Yes, in most cases. Check to make sure the primer contains no waxes (and most don't). If there are no waxes are in the primer, allow the primer to thoroughly dry, then apply Big Stretch.

Can I apply Through The Roof to wet surfaces?

Yes! Through the Roof can be applied to wet surfaces and has been found to work immediately when applied during a rain storm. Just be sure to use a stiff bristle paint brush, a metal trowel or foam brush to really work the product onto the surface, displacing all of the water. This will ensure the product will stick really well once all that water is gone. Through the Roof will take a bit longer than normal to cure when applied to a wet surface. It is NOT recommended for areas of continual submersion.

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I clean up Big Stretch with water?

Yes! Big Stretch is a water-based caulk, and will cleanup easily with water and a damp rag.

Can I paint Lexel?

Yes, Lexel is paintable with latex paints after 24-48 hours and after 7 days with oil based paints (longer with larger beads, or in cooler and/or humid conditions). Latex products are breathable and elastic, allowing the Lexel to continue to cure through it while maintaining a flexible film that won't crack. Some oil based products are not breathable, which can prevent the Lexel from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Lexel as it goes through its curing. Waiting for the Lexel to completely cure before painting over it with oil-based products is best and will help minimize any cracking paint.

Can I still use Big Stretch if I leave it outside overnight in the cold?

Yes! Big Stretch is freeze-thaw stable through 5 cycles. So, you don't have to worry if you leave it in the cold overnight. It will still be good when it thaws out.

Can I use an oil-based paint with eXact color?

No. Several bad things can happen, depending on the oil-based paint's formula:
- It won't mix in properly, like oil-in-water, and give uneven coloring
- It can cause the Exact Color to de-stabilize and congeal
- It can lead to the finished caulk being sticky when it dries
- It can lead to the dried caulk having poor performance and poor endurance

Can I use any color latex paint in eXact color?

YES! You can get an exact match to your paint when you mix it with eXact color.

Can I use any kind of brush to tool Big Stretch?

Yes! Big Stretch may be tooled in a unique way that keeps your fingers out of the mess! Use a wet foam sponge (or foam paint brush) to create a finished look in larger gaps.

Can I use anything other than backer rod or Grip Strip as a bond breaker?

Yes! Clear packing tape (or any other kind of mylar tape) is also a common form of a bond breaker. If you are already at the desired depth, just place a piece of tape over the back of the joint and apply your caulking or chinking. You can also use duct tape or polyethylene tape (like Poly Masking Tape).

Can I use Big Stretch around my crown molding?

Yes. Big Stretch will adhere fine and perform well in such applications. Be aware that most wood-based crown molding will shrink significantly after installation and can cause the Big Stretch (or any caulking) to tear in some areas. As such, some of the caulk will need to be repaired once the crown molding has done the majority of its drying out and shrinking.

Can I use Big Stretch on EIFS?

Yes, Big Stretch will adhere to EIFS. But some precautions are in order to get the best performance out of Big Stretch:

- It is best to apply Big Stretch to the underlying EIFS base coat, rather than the latex paint applied over top, in order to ensure better and longer-lasting adhesion. The paint can readily delaminate from the base coat, which would take the Big Stretch with it.
- If Big Stretch is applied to bare polystyrene foam at some joints, it could fail if that joint undergoes any extreme movement. This is due to the foam being inherently weaker and therefore unable to handle the stress of the tension it might receive from the combination of movement and the tenacious adhesion of Big Stretch.
- When fillet beads are called for (such as at intersections of EIFS and window frames), it is very important to apply a generous bead in order to accommodate the sometimes large movement that can occur in these joints. A minimum 1/4"

Can I use Big Stretch rather than Slab?

That's not a good idea. Big Stretch is quite a bit softer than Slab, which means it will easily be stressed and torn by foot and vehicle traffic. Slab's formula is much tougher than Big Stretch, which makes it ideal for high-stress horizontal surfaces.

Can I use Big Stretch to seal cracks or expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Big Stretch to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Big Stretch in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Can I use Conceal on the interior of my home?

Yes! Be sure to follow all proper application instructions as outlined in the Conceal info sheet.

Can I use eXact color for exterior applications?

Yes. eXact color is exellent for both interior and exterior applications.

Can I use Lexel in my bathroom?

Yes! Lexel is ideal for this application! Practice tooling the bead before applying since it skins over quickly

Can I use Lexel in my greenhouse or sauna (areas of high humidity / moisture)?

Yes. The smell of the solvents during early cure can sometimes be bothersome, so be sure to let it cure first before using the sauna.

Can I use Lexel on my camper/RV?

Lexel® is highly recommended for most surfaces on RV's/ Campers. It can be used on rubber roof membranes; however, while it will adhere as usual to the rubber membrane, it may tend to ripple or warp the rubber membranes. Cosmetically, it may not look good, but the performance of both the Lexel® and the roof remain the same. That said, it's a good idea to test the Lexel® first to ensure the aesthetic issues are OK. In addition, some RV's / Campers use polyethylene and polypropylene materials. Lexel® will not stick to them, so keep your eye out.

Can I use Lexel on the molding around my wood floors?

Yes! Clear Lexel may be used where you desire the surfaces to show through. This is especially helpful when natural woods are sealed, such as around molding or wood floors.

Can I use Lexel to adhere a mirror to the wall?

No. A mirror adhesive or mirror mastic is recommended. Some silver backings of mirrors can be affected by the solvents in Lexel and can lead to a "ghosting" image in the mirror wherever the Lexel is applied. In addition, the backing materials on mirrors are not always adequate for good adhesion. The backing can pull or tear away from the glass and stick to the wall, while the mirror falls to the ground. And who needs 7 years of bad luck?

Can I use Lexel to fill cracks in my driveway?

Sashco's Slab is the better choice and is made specifically to withstand high foot and vehicle traffic. Lexel tends to be too soft for these types of applications.

Can I use Lexel to help with wallpapering?

Yes! Lexel used over wallpaper edges prevents curling and is an excellent use of its ultra-clear formula.

Can I use MildewFree to adhere a mirror to a wall?

No. MildewFree is not designed to hold a significant amount of weight to a wall. Use a mirror adhesive.

Can I use MildewFree to adhere tile? How many?

Yes, but only small tiles (8" or less) and only for replacing broken tiles.

Can I use MildewFree to repair grout? What size?

Yes, if you like the way the product looks, and with grout lines less than 1/4" wide. There are better options if you have textured grout or large grout joints.

Can I use Mor-Flexx around my fireplace?

Yes, as long as the Mor-Flexx and the stone / brick it's sticking to won't get hotter than 250 degrees F (121 degrees C).

Can I use simple universal pigments in eXact color, instead of paint?

Yes, when mixed by experienced professionals. Contact Sashco for detailed guidance if you desire to use universal pigments instead of paint. Of course, it's best to simply use your color paint to ensure an eXact color match every time.

Can I use Slab in areas of hydrostatic pressure?

No. That's not a great application for Slab. It has not been tested for those conditions and is not resistant to such pressures.

Can I use Slab in concrete expansion joints?

Yes. Slab will adhere well and perform well. Just be aware that expansion joints do just that

Can I use Slab on asphalt?

Yes, Slab will adhere well to asphalt; however, be aware that asphalt is an inherently weak material. It tends to crumble and lose adhesion to itself over time. Slab will stick around for the long haul, but you may find some asphalt stuck to the back of the caulk when the asphalt cracks.

Can I use Slab to repair a tennis court surface?

No, that's not a good idea for a couple of reasons:

1) Tennis courts are typically made of modified asphalt, an inherently weak substrate. When Slab is attached to something already weak, substrate failure is likely.
2) Slab is supposed to be recessed, not flush with the surface, in order to last and perform properly. This recess will continue to cause the tennis balls to bounce and spin unpredictably and thus not solve the problem.

It would be better to use a sealant that is almost 100% solids that would be flush with the surface.

Can I use the dispensing nozzle instead of the threaded cap to mix my eXact color?

No. It might work OK for mixing the paint in, but it will not work when the activator is mixed into the colored base. Be sure to follow the given directions to ensure proper mixing and application.

Can I use Through the Roof on my camper/RV?

Through the Roof!® is highly recommended for most surfaces on RV's/ Campers. It can be used on rubber roof membranes; however, while it will adhere as usual to the rubber membrane, it may ripple or warp the rubber membranes over time. Cosmetically, it may not look good, but the performance of the Through the Roof!® remains the same. Therefore, it's a good idea to test Through the Roof!® to make sure the final appearance will be acceptable. In addition, some RV's / Campers use polyethylene and polypropylene materials. Through the Roof!® will not stick to them, so keep your eye out.

Can I use Through the Roof to coat my entire roof? Can I paint a wall with it to protect it from moisture?

Through the Roof is not recommended to be used as a full roof or wall coating. Because it remains somewhat soft and flexible, it tends to attract dirt and debris which is cosmetically unattractive. Also, if it is on a roof that may be walked on, it may become sticky or tacky under the sun, causing you to stick to it. Conversely, in cold, wet or snowy weather, it may become slippery, making it unsafe to walk on.

Can I use Through the Roof to seal or waterproof canvas?

Yes. Through the Roof brush grade can be used to seal tears in canvas. It may also work to water-proof canvas. To waterproof canvas, dilute with some solvent (say 1 part solvent to 5 parts Through the Roof) and apply. In cold weather, the canvas would get a bit on the stiff side but it would not affect performance. And again Sashco can't guarantee performance as we have not done any official testing on this application.

Can Lexel be used in a non-fish aquarium for animals such as lizards, gerbils, etc.?

No! Lexel can be toxic to animals of any kind because of the solvents in it.

Can Lexel be used in a swimming pool or hot tub?

Lexel is not a "marine" type sealant and is not recommended to be used in those areas, especially because we have not tested it with pool or hot tub chemicals, nor under water-submersion pressure . A "marine" type sealant or adhesive is recommended for those types of applications, as well as poly-sulfide or urethane sealants.

Can Lexel be used in an outdoor fish pond?

Yes. It must fully cure before putting in fish or other animals. This is okay because there is more "space" and larger volume of water into which the solvents can dissipate.

Can Lexel be used in food preparation areas or in a refrigerator or freezer?

Lexel is not FDA or USDA approved (and it has never been sought). For this reason, it is not recommended in food preparation areas. In refrigerators or freezers where approval is not needed, it will perform very well and hold up to the cold temperatures and can be cleaned with abrasive cleaners.

Can Lexel be used on a kayak? A boat?

Yes - below water line at your own risk since we haven't done the testing. We've had some very good feedback from customers on boats and kayaks, both above and below the waterline, with no significant difference between salt water and freshwater.

Can Lexel be used to repair a pond, a fountain, a bird bath, an aquarium, etc?

Depending on the exact application, it can be used to repair cracks or leaks in all of the above. Allow it to fully cure before putting animals in. Don't use in aquariums or enclosures with animals prone to chewing (gerbils, hamsters, rats, etc.) and only use in large aquariums (like outdoor ponds) in aquatic applications.

Can Lexel be used to seal drums with oil / gas / solvents inside?

No, not if they have any contact with the Lexel. Oil / gas / solvents will soften and dissolve the polymer in Lexel.

Can MildewFree be used as a glazing for windows?

No. Use a sealant specifically designed for window glazing or back bedding.

Can MildewFree be used in areas of submersion (i.e. a pond, pool, hot tub, aquarium, green house, bird bath, on boats and kayaks below water level)?

No, MildewFree is not designed for continuous submersion. It would be best to use a sealant approved for underwater use. Contact Customer Service for more guidance in these types of applications.

Can Mor-Flexx be used as a mortar or grout?

Mor-Flexx is not a mortar replacement or an actual grout. Mor-Flexx is designed to repair gaps or cracks in existing mortar. Actual mortar has load-carrying, structural ability, Mor-Flexx does not. Mor-Flexx is designed to seal cracks, not carry structural loads.

Can Mor-Flexx be used on a pool deck to repair cracks? Driveway? Sidewalk?

Mor-Flexx is not recommended for use on these horizontal surfaces. Caulk joints applied to pool decks, driveways, and sidewalks in particular are exposed to prolonged water submersion, the abrasion and abuse of high foot-traffic, and chemical exposure, to name a few. Instead, use Sashco's Slab, which is specifically designed to seal cracks in these areas

Can Mor-Flexx be used on expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Mor-Flexx to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Mor-Flexx in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Can you use Big Stretch on a mobile home or RV?

On a mobile home, yes. There are no substantial differences between mobile homes and conventional housing.

On an RV / motor homes, no. The non-porous materials often used & the type of direct movement and weather-exposure these vehicles experience often stress the Big Stretch too much. Lexel or Through The Roof would be better products to use for this application.

Does Big Stretch really stretch?

Yes! Big Stretch is super elastic and will twist, bend, stretch, or compress to absorb any movement a home can dish out. Big Stretch can span gaps up to 2" wide without cracking or losing adhesion.

Does Mor-Flexx adhere to rubber?

Yes, Mor-Flexx will adhere to rubber. It's a good idea to scuff up the rubber a bit where you want the Mor-Flexx to stick to provide for best adhesion.

Does Slab come in quart cartridges, 5 gallon pails, etc.?

Right now, Slab is available in 10.5 oz. standard caulking cartridges. However, please let us know if you'd like to see Slab in larger sizes. We're always happy to hear from our customers about their specific needs.

Does Slab contain a mildewcide?

Yes, Slab contains a pretty hefty dose of mildewcide to help prevent growth of mold and mildew on the surface of the caulk.

Does Through The Roof stick to most roofing materials?

Yes! Through The Roof will adhere to fiberglass / asphalt shingles, cedar shakes, plywood, water-based acrylic roof coatings, cement, slate and glazed tiles, asphalt roof cement, and many more. Refer to theThrough the Roof brochure for a more comprehensive list.

How can I remove Lexel?

Lexel is not very easy to remove (as you've probably discovered). Mineral spirits will do the trick. Apply some and allow it to sit, then use a scraper or razor blade to remove Lexel. Commonly available silicone removers based on mineral spirits will also do the trick and are often less messy. In particular, McKanica Silicone Caulk Remover works great.

How do I clean up Slab that is still wet?

Soap and water will do the trick. Easy!

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How does cross-linking improve MildewFree?

The cross-linking within the MildewFree formula will toughen the surface of the caulk so it can be routinely scrubbed to remove soap scum, dirt, and other residue. A cross-linked film also prevents the sealant from holding a lot of moisture, which can soften or damage the sealant over time.

How long can I store my mixed eXact color?

When sealed with the clear cap, mixed eXact color can be stored and used for 1 year after being mixed.

How long will Big Stretch last? Does it come with a warranty?

Big Stretch comes with a limited lifetime warranty. Refer to warranty details on our website, on product packaging or on the Big Stretch brochure.

How long will Lexel last? Does it come with a warranty?

Lexel comes with a limited lifetime warranty. Refer to warranty details on our website, on the product packaging or the Lexel brochure.

How long will MildewFree last? Does it come with a warranty?

MildewFree is one of a kind in the market. It comes with a 7 year warranty that includes labor should the product need to be re-installed, as well as Sashco's Limited Lifetime Warranty applicable to all our sealants. Refer to warranty details on the packaging or the MildewFree brochure.

How long will Mor-Flexx last? Does it come with a warranty?

Mor-Flexx comes with a limited lifetime warranty. Refer to warranty details on the packaging or on the Mor-Flexx Brochure.

How long will Through the Roof last? Does it come with a warranty?

Through the Roof comes with a limited lifetime warranty. Refer to warranty details Refer to warranty details on our website, on the product packaging or the Through the Roof brochure.

I applied MildewFree 2 days ago. When I turned my shower on, it started to run. Why?

There could be a number of issues going on, but most likely, the sealant hasn't had enough time to cure. The tube says 48 hours, but that's in ideal conditions. Especially if the humidity has been high and/or the temperature has been low, the MildewFree may not yet be cured enough to withstand direct moisture. Try giving it some more time to cure. Running a fan in the area will help speed curing, too.

I applied Slab today and it's supposed to rain tomorrow. Do I need to cover it?

Yes, it would be best to cover Slab if you expect rain within 24 hours of application. Simply cover with a tarp or something similar to keep rain off of it.

I applied Slab yesterday and it's still soft. How long will it take for it to dry? Can I drive or walk on it yet?

Dry time will depend on how much Slab was applied, the temperature and humidity. Larger beads will take longer to cure, and cooler and more humid conditions will also extend the cure time. In ideal temps and humidity (less than 50% humidity and 70

I have tire tread marks on the Slab I just applied. How do I clean those off?

Soap and water should remove those tread marks from the Slab. You might need to use a nylon brush (the kind you use on dishes) to get at any stubborn spots.

I put Slab down on my driveway a few hours ago and didn't realize I'd need to get my car out of the garage. Now what?

Put some boards or plywood over the product and drive on that instead. Then be sure to avoid driving on it for at least 24 hours to allow it to cure.

I see that Slab has a cancer warning on the cartridge. Should I be concerned?

We use naturally occurring silica sand in Slab to give it texture (yes, the same sand you can find on the beach). A small portion of this sand has crystalline silica. It is the airborne, breathable portion of the crystalline silica that is considered a carcinogen. As long as you don't sand or grind the surface of the Slab material after it is cured without using proper respirator equipment, your exposure to any crystalline silica is less than it would be if you were to visit the beach.

I was a bit messy and got some Slab where I don't want it. Now it's dry. How do I remove it?

Try a citrus-based cleaner first. That should help loosen it up some. Then try scraping at it with a plastic scraper to loosen it more and pull it off. If that doesn't work, you can try mineral spirits to loosen it more.

Is Big Stretch FDA approved for use in areas of food preparation, refrigerators, freezers, etc.?

It would be ok in the freezer / refrigerator environment (where FDA or USDA approval is not required), as the service range is -30F degrees to 250F degrees. However, it should not be used outside of those areas, as Big Stretch is not FDA or USDA approved.

Is Big Stretch paintable?

Yes, Big Stretch is paintable within 4 hours with latex based paints, stains and primers and after 1 week with oil based paints, stains, and primers. Latex coatings are breathable and some are quite elastic, allowing the Big Stretch to continue to cure through it while maintaining a flexible film that won't crack.

Lower quality latex paints are seldom as elastic as Big Stretch and can crack while the caulk cures and shrinks. As such, it is best to let Big Stretch dry completely before painting with lower quality paints.

Some oil based products are not breathable, which can prevent the Big Stretch from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Big Stretch as it goes through its curing. Waiting the full week to cover with oil-based products helps ensure that cracking will not happen.

Is Lexel a silicone?

No. Lexel is a co-polymer, or synthetic, rubber. It has no silicone rubber in it. Synthetic rubbers like Lexel are more durable, are extremely elastic and have UV inhibitors. Lexel can often times be used in areas where a silicone is recommended.

Is Lexel electrically conductive?

Lexel is better characterized as an insulator or dialectric. It does not conduct electricity. However, Sashco does not recommend Lexel being used for direct electrical applications.

Is Lexel fire safe?

No! It will burn

Is MildewFree a silicone?

No, MildewFree is not a silicone. It is an all acrylic sealant.

Is MildewFree paintable?

Yes, you can paint over MildewFree after 4 hours with most high quality water-based elastomeric paints. For best results, wait at least 24 hours (or longer in cool or humid conditions) before painting. Wait at least a week before painting with oil-based paints, which can stay tacky if the sealant is not fully cured.

Is Slab waterproof?

Once fully cured, yes. During early cure, be sure to protect it from heavy rains, as that could cause the product to washout.

Is there a way to prevent air bubbles in my eXact color when I mix it?

No. There will inevitably be some air bubbles that form when it is mixed.

Is Through The Roof easy to clean up?

Yes! Tools may be cleaned with mineral spirits or paint thinner. We recommend cleaning hands with a citrus-based or waterless hand cleansers.

Is Through The Roof Waterproof?

Yes! Through The Roof is waterproof

Is your chinking / caulking supposed to stay "soft"?

Yes. All of our chinking and caulking products are formulated to retain their elasticity (or "softness") for many years.

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

On the average, what is the life expectancy of Through The Roof vs. asphalt?

In our testing, we've found Through the Roof to last at least 20 times longer. The testing is still going, so that is likely to go up.

Slab cracked! What happened, and how can I fix it?

If Slab cracked down the middle, that usually means either: a) the joint is now wider and it stressed the caulk too much or b) Slab may have been applied either too thin or too thick and isn't able to stretch properly. In either case, the fix is easy:

1. Use a razor blade to release any tension in the caulk. 2. Clean the joint with soap and water to remove dust, gravel, sand, etc. 3. Insert some of Sashco's Pre-Caulking Filler Rope (or similar), if some wasn't used before. 4. Apply more Slab over the filler rope, making sure it's sticking to the leftover product. Smooth the bead to ensure good adhesion.

If Slab is no longer sticking to the side of the joint, you'll need to cut it out and re-do it. That's usually caused by some sort of chemical that Slab won't stick to, or the substrate itself being weak. (This is common with asphalt or concrete that was poured in cold temps and wasn't able to properly cure itself.) It will help to sand down the sides of the joint with a wire brush to ensure any loose concrete is removed and the Slab will be sticking to a good, sound surface.

Slab is too dark for my concrete. What can I do to help it match better?

The color of Slab was chosen to match concrete that is aged and has darkened. If your concrete is newer, it may be darker than you need. Time will darken your concrete some so that Slab will eventually blend in. Until then, Slab is paintable. Feel free to paint over it with paints made specifically for concrete floors to get a better match.

The surface of my concrete is spalling. Can I use Slab to repair it?

No. Slab is not a good "glue" for spalling concrete. It would be best to remove the spalling or consider having a concrete contractor come out to fix it.

What are isocyanates? Why does it matter that Slab doesn't have them?

Isocyanates are highly toxic, both to breathe and to touch. Many concrete repair products contain them. Slab doesn't. So breathe easy, save the planet and fix your concrete cracks all at the same time.

What are the benefits of a co-polymer rubber formula like Lexel?

Depending on the type of polymers used, synthetic rubbers like Lexel are more durable, have high tensile strength and higher UV inhibitors. They also shrink more. The solvents in Lexel "clean" the surface for better adhesion and the additives in it soften it and make it more flexible and elastic.

What do you use to tool your chinking or caulking?

A variety of tools and techniques can be used

What is Big Stretch?

Big Stretch is a water-based acrylic latex sealant.

What is Lexel made of?

Lexel is a solvent-based co-polymer rubber sealant.

What is MildewFree?

MildewFree is a water-based all acrylic sealant that has been designed and tested to be resistant to mildew growth.

What is Slab?

Slab is a 100% water-based acrylic latex caulk for concrete crack repair. Unlike other concrete repair products, it's not sticky and difficult to apply, nor does it dry hard and crack. Slab combines excellent adhesion and superior elasticity to result in a concrete crack repair that lasts.

What is the best way to remove Big Stretch?

It is not always necessary to remove Big Stretch. The surface can often be cleaned and the joint re-caulked

What is the best way to remove MildewFree?

First, peel and scrape away as much material as possible. Be careful not to damage soft or brittle surfaces. Then, if you prefer, a solvent (caulk remover) can be used to soften the caulk film and make it easier to remove the residue. Make sure the chemical is approved for your surface to avoid damaging it. If you prefer not to use solvents, you may soften the residue with soap and water and continue to scrape or scrub with an abrasive cleaning pad until the surface is clean.

What product should I use if I have to use sulfamic acid to clean my walls (usually after tiling & grouting a shower wall)?

Lexel would be the best product to use. It is resistant to breakdown by sulfamic acid.

What solvents does Lexel have in it?

Download the product-specific MSDS for more information.

What solvents does Through the Roof have in it?

Refer to the MSDS for more information.

What will Big Stretch adhere to?

Big Stretch will adhere to most construction materials. Refer to theBig Stretch brochure for a more comprehensive list.

What will happen if I don't wait for the Big Stretch to cure before painting over it with an oil-based paint?

As the Big Stretch continues to cure and shrink, the paint will most likely crack over top of the Big Stretch. It's also possible for the Big Stretch itself to crack if it has not undergone the majority of its curing, as the oil-based stain can interfere with Big Stretch's ability to form the proper film. So, all in all, it is just best to wait. If you can't, be prepared to do some re-painting in a few areas.

What will happen if it rains shortly after I have applied Through the Roof?

Through the Roof can actually be applied to wet surfaces and has been found to work immediately when applied during a rain storm. If it gets wet during or shortly after application, it will simply take a bit longer than normal to cure. It is NOT recommended for areas of continual submersion.

What's the difference between backer rod and Grip Strip?

Both are bond breakers, but backer rod is usually round and Grip Strip is trapezoid shaped.

When do you use MildewFree vs. using Sashco's Lexel or Big Stretch?

Big Stretch is not recommended for use in bathrooms or kitchens, where there might be routine exposure to water. MildewFree and Lexel can be used in bathrooms and kitchens, but there are significant differences. MildewFree is water-based, and Lexel is solvent-based, so you can clean up tools, hands, etc. with MildewFree on them with water. Lexel will require solvents to clean up. MildewFree is easier to tool than Lexel, and has a flatter sheen to it. In addition, the colors of MildewFree have been matched to common kitchen and bath colors, and should blend into the joint a little more than Lexel, which is only available in clear or a bright white color.

When I use eXact color, will the color be uniform throughout the cartridge?

Yes. If eXact color is mixed as directed (either by hand or in a mixing machine), the paint will be distributed evenly throughout the cartridge before the activator is added and mixed in. Once thickened by the activator, the color will be uniform throughout the cartridge.

Where should I store unmixed cartridges of eXact color?

It is best to store them in a cool (but not freezing), dry place. Storing in hot temperatures can cause the product to skin over, which will in turn affect mixing, final appearance and performance.

Where should I use Slab vs. Sashco's Mor-Flexx

Slab is specifically made for horizontal concrete, brick and stone surfaces. It's specifically formulated to withstand heavy foot and vehicle traffic. As part of that, Slab shrinks more than Mor-Flexx and is design to be recessed below the surface, which helps with durability. Mor-Flexx is ideal for vertical applications: walls, around your chimney, brick, stucco and the like. It comes in a wide variety of colors to match all of those different surfaces, but isn't tough enough to handle foot and vehicle traffic. Mor-Flexx doesn't shrink nearly as much as Slab, remaining flush with the surface, which is the ideal aesthetic for a vertical surface where you need the repair to blend in.

Which paints are best to use with Big Stretch?

Most any latex paint will be compatible with Big Stretch. However, be aware that some of the lower-end flat latex paints may crack over Big Stretch. Why? Low-end flat latex paints are full of solids and fillers that are not flexible. The Big Stretch will stretch with movement but the paint will not, causing the paint to crack over the surface of the caulk. Higher-end latex paints do not exhibit this problem as much.

Why do I have to fill checks and cracks?

Checks allow moisture and wood-destroying fungi to find their way deep into the interior of wood. When fungi have a food source (the wood), moisture, oxygen and the right temperature, they can lead to rot, which, in some cases, can negatively affect the structural integrity of the home. And it can be very costly to fix rot. Filling in those checks and cracks will save you money and stress down the line.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.

Why does Big Stretch clear look white?

When Big Stretch® clear is first applied, it has a milky white appearance. Not to worry, though - as it dries, it turns clear.

Why doesn't the color of the eXact color match my paint when it comes out of the tube?

Don't worry! As the product dries, it will be an eXact color match. But out of the tube, it may look a little lighter in color.

Why is my paint cracking over the Big Stretch I applied? What can I do about it?

Most likely this is due to Big Stretch not being fully cured before the paint was applied. Lower-quality flat paints are especially susceptible to cracking since they are chock-full of fillers that make them rigid, but humid weather and abnormal movement can cause this at times, as well.

To fix this, first allow the Big Stretch to cure completely. (This can take anywhere from 4 days to 2 weeks, depending on temp and humidity). Follow with a new coat of primer and another coat of the same paint. It should blend in with no problems.

Will Big Stretch adhere to Protecto wrap?

No. The backing of Protecto wrap is polyethylene. It will work great as a bond breaker. Also, Big Stretch will not attack the bitumen/butyl adhesive of these kinds of self-adhering flashing materials.

Will Big Stretch help sound proof my home?

Sealing up cracks and cavities – like where the drywall meets the floor, around windows & doors, around electrical boxes, etc. – will always help reduce sound transmission in a home.  In addition, if a bead of Big Stretch is put on the wall studs prior to drywall installation, this can help further dampen sound transmission, as the sound waves will be bouncing off a much more elastic & soft material (the Big Stretch), rather than the hard stud wood.

Will Lexel adhere well to cured concrete that has gotten wet?

Yes, but some problems may surface. Since concrete is porous, the Lexel may have a hard time maintaining adhesion. As the sun comes out and heats up the moisture in the concrete, it will try to escape and may stress the Lexel to the point of failure. Also, many concrete form release agents contain silicones, waxes, etc. that can interfere with Lexel adhesion

Will Lexel help prevent air leaks in my home?

Yes! Lexel keeps the weather outside. It seals thresholds, sills, siding, vents, pipes and air conditioners. Lexel is also good for leaky air ducts which can heat up your walls instead of your living area. Use Lexel to permanently seal all connections.

Will Lexel prevent radon gas infiltration?

With radon gas, it is best to set up a proper ventilation system to direct the gas outdoors. Lexel can temporarily keep radon gas from getting to the interior of the home; however, eventually the gas can diffuse through any sealant (including Lexel), requiring ventilation.

Will Lexel stay clear looking?

Yes! Lexel will always remain ultra-clear. Plus, Lexel seals beautifully while resisting mildew and dust collection. Once cured, it can withstand scrubbing with abrasive household cleaners.

Will my paint become shiny wherever I have applied it over Big Stretch?

NO. While many water-based latex sealants will "flash" (be shiny) under paint, Big Stretch will not. This means that your flat paint will indeed look flat, or your semi-gloss look semi-gloss instead of glossy over top of Big Stretch.

Will the gloss or sheen of eXact color match that of my paint?

With semi-gloss or gloss paints the match will be very close. With flat or eggshell sheens the eXact color will be a little glossier.
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Are there products other than McKanica® to use in removing silicone?

There are several brands on the market. We have tested a few of them, and the McKanica® formula stood out as the best to remove a variety of silicone residues from the surface. If you cannot find the McKanica® product, try to find a caulk remover that contains both alcohol and a solvent such as mineral spirits. The combination of alcohol and solvents is more potent and effective.

Are your products compatible with other products?

Contact Customer Service at 1-800-767-5656. They can give you general information on chemical compatibility between Sashco's products and others.

Can Big Stretch be used as a glazing on windows?

A soft gooey "sticky" sealer such as a butyl caulk is needed for back bedding. We do not recommend any of our products be used as glazing or as a back-bedding.

Can Big Stretch be used in my shower?

No, it would be best to use Lexel or MildewFree for these types of applications. Big Stretch can be used for other applications in the bathroom, such as base boards, crown molding, and sealing between the tub and floor.

Can Big Stretch be used on roof applications?

No. There is too much direct and extreme weather exposure. We recommend Sashco's Through the ROOF! instead.

Can I apply Through The Roof to wet surfaces?

Yes! Through the Roof can be applied to wet surfaces and has been found to work immediately when applied during a rain storm. Just be sure to use a stiff bristle paint brush, a metal trowel or foam brush to really work the product onto the surface, displacing all of the water. This will ensure the product will stick really well once all that water is gone. Through the Roof will take a bit longer than normal to cure when applied to a wet surface. It is NOT recommended for areas of continual submersion.

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I use any of your products with asphalt?

All of our sealant products will adhere well to asphalt; however, be aware that asphalt does not have much internal strength itself and, as such, readily fails on its own under stress. Repairs and regular maintenance will most likely be required wherever there is asphalt.

Can I use Big Stretch to seal cracks or expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Big Stretch to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Big Stretch in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Can I use Conceal on the interior of my home?

Yes! Be sure to follow all proper application instructions as outlined in the Conceal info sheet.

Can I use Jomax house cleaner prior to using your products?

Jomax is an acetic acid so will be fine to use prior to applying any Sashco products. Obviously, it will need to be thoroughly neutralized prior to applying any finishing products (ours or anyone else's).

Can I use Lexel in my bathroom?

Yes! Lexel is ideal for this application! Practice tooling the bead before applying since it skins over quickly

Can I use Lexel on the molding around my wood floors?

Yes! Clear Lexel may be used where you desire the surfaces to show through. This is especially helpful when natural woods are sealed, such as around molding or wood floors.

Can I use Lexel to adhere a mirror to the wall?

No. A mirror adhesive or mirror mastic is recommended. Some silver backings of mirrors can be affected by the solvents in Lexel and can lead to a "ghosting" image in the mirror wherever the Lexel is applied. In addition, the backing materials on mirrors are not always adequate for good adhesion. The backing can pull or tear away from the glass and stick to the wall, while the mirror falls to the ground. And who needs 7 years of bad luck?

Can I use Lexel to fill cracks in my driveway?

Sashco's Slab is the better choice and is made specifically to withstand high foot and vehicle traffic. Lexel tends to be too soft for these types of applications.

Can I use Lexel to help with wallpapering?

Yes! Lexel used over wallpaper edges prevents curling and is an excellent use of its ultra-clear formula.

Can I use MildewFree to adhere a mirror to a wall?

No. MildewFree is not designed to hold a significant amount of weight to a wall. Use a mirror adhesive.

Can I use MildewFree to adhere tile? How many?

Yes, but only small tiles (8" or less) and only for replacing broken tiles.

Can I use MildewFree to repair grout? What size?

Yes, if you like the way the product looks, and with grout lines less than 1/4" wide. There are better options if you have textured grout or large grout joints.

Can I use Mor-Flexx around my fireplace?

Yes, as long as the Mor-Flexx and the stone / brick it's sticking to won't get hotter than 250 degrees F (121 degrees C).

Can I use Slab in areas of hydrostatic pressure?

No. That's not a great application for Slab. It has not been tested for those conditions and is not resistant to such pressures.

Can I use Slab in concrete expansion joints?

Yes. Slab will adhere well and perform well. Just be aware that expansion joints do just that

Can I use Slab on asphalt?

Yes, Slab will adhere well to asphalt; however, be aware that asphalt is an inherently weak material. It tends to crumble and lose adhesion to itself over time. Slab will stick around for the long haul, but you may find some asphalt stuck to the back of the caulk when the asphalt cracks.

Can I use Through the Roof to coat my entire roof? Can I paint a wall with it to protect it from moisture?

Through the Roof is not recommended to be used as a full roof or wall coating. Because it remains somewhat soft and flexible, it tends to attract dirt and debris which is cosmetically unattractive. Also, if it is on a roof that may be walked on, it may become sticky or tacky under the sun, causing you to stick to it. Conversely, in cold, wet or snowy weather, it may become slippery, making it unsafe to walk on.

Can Lexel be used in food preparation areas or in a refrigerator or freezer?

Lexel is not FDA or USDA approved (and it has never been sought). For this reason, it is not recommended in food preparation areas. In refrigerators or freezers where approval is not needed, it will perform very well and hold up to the cold temperatures and can be cleaned with abrasive cleaners.

Can MildewFree be used as a glazing for windows?

No. Use a sealant specifically designed for window glazing or back bedding.

Can Mor-Flexx be used as a mortar or grout?

Mor-Flexx is not a mortar replacement or an actual grout. Mor-Flexx is designed to repair gaps or cracks in existing mortar. Actual mortar has load-carrying, structural ability, Mor-Flexx does not. Mor-Flexx is designed to seal cracks, not carry structural loads.

Can Mor-Flexx be used on a pool deck to repair cracks? Driveway? Sidewalk?

Mor-Flexx is not recommended for use on these horizontal surfaces. Caulk joints applied to pool decks, driveways, and sidewalks in particular are exposed to prolonged water submersion, the abrasion and abuse of high foot-traffic, and chemical exposure, to name a few. Instead, use Sashco's Slab, which is specifically designed to seal cracks in these areas

Can Mor-Flexx be used on expansion joints at the foundation of a home?

In many cases, yes - since these areas are largely away from foot traffic. However, in order for Mor-Flexx to have a decent chance at handling much expansion / contraction (which is often severe in these locations), it is critical to properly clean the surfaces and install backer rod before applying the sealant. Don't use Mor-Flexx in these joints if they will be subject to submersion. And be aware that most sealants will have a difficult time in this situation due to the large amounts of movement that usually occur. So, be prepared to perform routine maintenance.

Does Through The Roof stick to most roofing materials?

Yes! Through The Roof will adhere to fiberglass / asphalt shingles, cedar shakes, plywood, water-based acrylic roof coatings, cement, slate and glazed tiles, asphalt roof cement, and many more. Refer to theThrough the Roof brochure for a more comprehensive list.

How do I get rid of flies?

The only way to eliminate severe fly infestations is by locating their entry points into your home. If you don't eliminate these "highways," each year you can expect the same problem. Contact Customer Service for a referral to someone who can perform a thermographic survey on your home. This type of survey can help pin-point where these pests are entering your home.

How do I know the chemical cleaner /stripper I used is neutralized?

Get a hold of pH strips to test. Test the surface before applying the chemical and afterwards. The surface should come back to where it was or close to 7 (neutral). pH strips can be easily obtained at most paint stores, pool supply stores or from online retailers. You might even be able to get a few from your kid's science teacher.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How many people does it take to run a Kernel?

It only takes one person to run the machine at a time, but, since it is physically demanding to handle a long hose under pressure, it is a good idea to have a couple of people on hand to take turns operating the machine and keeping the pot full of media.

I applied MildewFree 2 days ago. When I turned my shower on, it started to run. Why?

There could be a number of issues going on, but most likely, the sealant hasn't had enough time to cure. The tube says 48 hours, but that's in ideal conditions. Especially if the humidity has been high and/or the temperature has been low, the MildewFree may not yet be cured enough to withstand direct moisture. Try giving it some more time to cure. Running a fan in the area will help speed curing, too.

I applied Slab today and it's supposed to rain tomorrow. Do I need to cover it?

Yes, it would be best to cover Slab if you expect rain within 24 hours of application. Simply cover with a tarp or something similar to keep rain off of it.

I applied Slab yesterday and it's still soft. How long will it take for it to dry? Can I drive or walk on it yet?

Dry time will depend on how much Slab was applied, the temperature and humidity. Larger beads will take longer to cure, and cooler and more humid conditions will also extend the cure time. In ideal temps and humidity (less than 50% humidity and 70

I caulked my tub a couple weeks ago. Now the caulk is splitting down the middle. What's happening?

If you're like most people, you probably caulked around your tub while it was empty, which means the joint wasn't at it widest. The caulk probably got stressed a little and split. Try filling the tub with water and re-caulking. No need to remove what's already in there - if it's split down the middle, the fix is just applying more. Filling the tub with water will ensure the joint is at it's widest and the caulk will stretch correctly.

I put Slab down on my driveway a few hours ago and didn't realize I'd need to get my car out of the garage. Now what?

Put some boards or plywood over the product and drive on that instead. Then be sure to avoid driving on it for at least 24 hours to allow it to cure.

Is Big Stretch FDA approved for use in areas of food preparation, refrigerators, freezers, etc.?

It would be ok in the freezer / refrigerator environment (where FDA or USDA approval is not required), as the service range is -30F degrees to 250F degrees. However, it should not be used outside of those areas, as Big Stretch is not FDA or USDA approved.

Is Big Stretch paintable?

Yes, Big Stretch is paintable within 4 hours with latex based paints, stains and primers and after 1 week with oil based paints, stains, and primers. Latex coatings are breathable and some are quite elastic, allowing the Big Stretch to continue to cure through it while maintaining a flexible film that won't crack.

Lower quality latex paints are seldom as elastic as Big Stretch and can crack while the caulk cures and shrinks. As such, it is best to let Big Stretch dry completely before painting with lower quality paints.

Some oil based products are not breathable, which can prevent the Big Stretch from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Big Stretch as it goes through its curing. Waiting the full week to cover with oil-based products helps ensure that cracking will not happen.

Is Slab waterproof?

Once fully cured, yes. During early cure, be sure to protect it from heavy rains, as that could cause the product to washout.

Is your chinking / caulking supposed to stay "soft"?

Yes. All of our chinking and caulking products are formulated to retain their elasticity (or "softness") for many years.

On the average, what is the life expectancy of Through The Roof vs. asphalt?

In our testing, we've found Through the Roof to last at least 20 times longer. The testing is still going, so that is likely to go up.

Slab cracked! What happened, and how can I fix it?

If Slab cracked down the middle, that usually means either: a) the joint is now wider and it stressed the caulk too much or b) Slab may have been applied either too thin or too thick and isn't able to stretch properly. In either case, the fix is easy:

1. Use a razor blade to release any tension in the caulk. 2. Clean the joint with soap and water to remove dust, gravel, sand, etc. 3. Insert some of Sashco's Pre-Caulking Filler Rope (or similar), if some wasn't used before. 4. Apply more Slab over the filler rope, making sure it's sticking to the leftover product. Smooth the bead to ensure good adhesion.

If Slab is no longer sticking to the side of the joint, you'll need to cut it out and re-do it. That's usually caused by some sort of chemical that Slab won't stick to, or the substrate itself being weak. (This is common with asphalt or concrete that was poured in cold temps and wasn't able to properly cure itself.) It will help to sand down the sides of the joint with a wire brush to ensure any loose concrete is removed and the Slab will be sticking to a good, sound surface.

Slab is too dark for my concrete. What can I do to help it match better?

The color of Slab was chosen to match concrete that is aged and has darkened. If your concrete is newer, it may be darker than you need. Time will darken your concrete some so that Slab will eventually blend in. Until then, Slab is paintable. Feel free to paint over it with paints made specifically for concrete floors to get a better match.

The surface of my concrete is spalling. Can I use Slab to repair it?

No. Slab is not a good "glue" for spalling concrete. It would be best to remove the spalling or consider having a concrete contractor come out to fix it.

What can I use to blend the lap marks?

When lap marks occur, it is often impossible to completely eliminate them. The best that can be done is to either "feather" them into the adjoining regions with a relatively dry brush or by expertly "fogging" the area with an airless sprayer. In both cases, a little practice will be necessary to get the right look.

What is the best way to remove Big Stretch?

It is not always necessary to remove Big Stretch. The surface can often be cleaned and the joint re-caulked

What product should I use if I have to use sulfamic acid to clean my walls (usually after tiling & grouting a shower wall)?

Lexel would be the best product to use. It is resistant to breakdown by sulfamic acid.

What will Big Stretch adhere to?

Big Stretch will adhere to most construction materials. Refer to theBig Stretch brochure for a more comprehensive list.

What will happen if it rains shortly after I have applied Through the Roof?

Through the Roof can actually be applied to wet surfaces and has been found to work immediately when applied during a rain storm. If it gets wet during or shortly after application, it will simply take a bit longer than normal to cure. It is NOT recommended for areas of continual submersion.

When do you use MildewFree vs. using Sashco's Lexel or Big Stretch?

Big Stretch is not recommended for use in bathrooms or kitchens, where there might be routine exposure to water. MildewFree and Lexel can be used in bathrooms and kitchens, but there are significant differences. MildewFree is water-based, and Lexel is solvent-based, so you can clean up tools, hands, etc. with MildewFree on them with water. Lexel will require solvents to clean up. MildewFree is easier to tool than Lexel, and has a flatter sheen to it. In addition, the colors of MildewFree have been matched to common kitchen and bath colors, and should blend into the joint a little more than Lexel, which is only available in clear or a bright white color.

Where should I use Slab vs. Sashco's Mor-Flexx

Slab is specifically made for horizontal concrete, brick and stone surfaces. It's specifically formulated to withstand heavy foot and vehicle traffic. As part of that, Slab shrinks more than Mor-Flexx and is design to be recessed below the surface, which helps with durability. Mor-Flexx is ideal for vertical applications: walls, around your chimney, brick, stucco and the like. It comes in a wide variety of colors to match all of those different surfaces, but isn't tough enough to handle foot and vehicle traffic. Mor-Flexx doesn't shrink nearly as much as Slab, remaining flush with the surface, which is the ideal aesthetic for a vertical surface where you need the repair to blend in.

Why do I have to fill checks and cracks?

Checks allow moisture and wood-destroying fungi to find their way deep into the interior of wood. When fungi have a food source (the wood), moisture, oxygen and the right temperature, they can lead to rot, which, in some cases, can negatively affect the structural integrity of the home. And it can be very costly to fix rot. Filling in those checks and cracks will save you money and stress down the line.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.

Why does Big Stretch clear look white?

When Big Stretch® clear is first applied, it has a milky white appearance. Not to worry, though - as it dries, it turns clear.

Will Big Stretch help sound proof my home?

Sealing up cracks and cavities – like where the drywall meets the floor, around windows & doors, around electrical boxes, etc. – will always help reduce sound transmission in a home.  In addition, if a bead of Big Stretch is put on the wall studs prior to drywall installation, this can help further dampen sound transmission, as the sound waves will be bouncing off a much more elastic & soft material (the Big Stretch), rather than the hard stud wood.

Will Lexel adhere well to cured concrete that has gotten wet?

Yes, but some problems may surface. Since concrete is porous, the Lexel may have a hard time maintaining adhesion. As the sun comes out and heats up the moisture in the concrete, it will try to escape and may stress the Lexel to the point of failure. Also, many concrete form release agents contain silicones, waxes, etc. that can interfere with Lexel adhesion

Will Lexel help prevent air leaks in my home?

Yes! Lexel keeps the weather outside. It seals thresholds, sills, siding, vents, pipes and air conditioners. Lexel is also good for leaky air ducts which can heat up your walls instead of your living area. Use Lexel to permanently seal all connections.
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Roof, Gutters and Flashing

Are there products other than McKanica® to use in removing silicone?

There are several brands on the market. We have tested a few of them, and the McKanica® formula stood out as the best to remove a variety of silicone residues from the surface. If you cannot find the McKanica® product, try to find a caulk remover that contains both alcohol and a solvent such as mineral spirits. The combination of alcohol and solvents is more potent and effective.

Are your products compatible with other products?

Contact Customer Service at 1-800-767-5656. They can give you general information on chemical compatibility between Sashco's products and others.

Can Big Stretch be used on roof applications?

No. There is too much direct and extreme weather exposure. We recommend Sashco's Through the ROOF! instead.

Can I apply Through The Roof to wet surfaces?

Yes! Through the Roof can be applied to wet surfaces and has been found to work immediately when applied during a rain storm. Just be sure to use a stiff bristle paint brush, a metal trowel or foam brush to really work the product onto the surface, displacing all of the water. This will ensure the product will stick really well once all that water is gone. Through the Roof will take a bit longer than normal to cure when applied to a wet surface. It is NOT recommended for areas of continual submersion.

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I use Through the Roof to coat my entire roof? Can I paint a wall with it to protect it from moisture?

Through the Roof is not recommended to be used as a full roof or wall coating. Because it remains somewhat soft and flexible, it tends to attract dirt and debris which is cosmetically unattractive. Also, if it is on a roof that may be walked on, it may become sticky or tacky under the sun, causing you to stick to it. Conversely, in cold, wet or snowy weather, it may become slippery, making it unsafe to walk on.

Does Through The Roof stick to most roofing materials?

Yes! Through The Roof will adhere to fiberglass / asphalt shingles, cedar shakes, plywood, water-based acrylic roof coatings, cement, slate and glazed tiles, asphalt roof cement, and many more. Refer to theThrough the Roof brochure for a more comprehensive list.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

On the average, what is the life expectancy of Through The Roof vs. asphalt?

In our testing, we've found Through the Roof to last at least 20 times longer. The testing is still going, so that is likely to go up.

What will happen if it rains shortly after I have applied Through the Roof?

Through the Roof can actually be applied to wet surfaces and has been found to work immediately when applied during a rain storm. If it gets wet during or shortly after application, it will simply take a bit longer than normal to cure. It is NOT recommended for areas of continual submersion.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.
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Slab

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I use Big Stretch rather than Slab?

That's not a good idea. Big Stretch is quite a bit softer than Slab, which means it will easily be stressed and torn by foot and vehicle traffic. Slab's formula is much tougher than Big Stretch, which makes it ideal for high-stress horizontal surfaces.

Can I use Lexel to fill cracks in my driveway?

Sashco's Slab is the better choice and is made specifically to withstand high foot and vehicle traffic. Lexel tends to be too soft for these types of applications.

Can I use Slab in areas of hydrostatic pressure?

No. That's not a great application for Slab. It has not been tested for those conditions and is not resistant to such pressures.

Can I use Slab in concrete expansion joints?

Yes. Slab will adhere well and perform well. Just be aware that expansion joints do just that

Can I use Slab on asphalt?

Yes, Slab will adhere well to asphalt; however, be aware that asphalt is an inherently weak material. It tends to crumble and lose adhesion to itself over time. Slab will stick around for the long haul, but you may find some asphalt stuck to the back of the caulk when the asphalt cracks.

Can I use Slab to repair a tennis court surface?

No, that's not a good idea for a couple of reasons:

1) Tennis courts are typically made of modified asphalt, an inherently weak substrate. When Slab is attached to something already weak, substrate failure is likely.
2) Slab is supposed to be recessed, not flush with the surface, in order to last and perform properly. This recess will continue to cause the tennis balls to bounce and spin unpredictably and thus not solve the problem.

It would be better to use a sealant that is almost 100% solids that would be flush with the surface.

Can Mor-Flexx be used on a pool deck to repair cracks? Driveway? Sidewalk?

Mor-Flexx is not recommended for use on these horizontal surfaces. Caulk joints applied to pool decks, driveways, and sidewalks in particular are exposed to prolonged water submersion, the abrasion and abuse of high foot-traffic, and chemical exposure, to name a few. Instead, use Sashco's Slab, which is specifically designed to seal cracks in these areas

Does Slab come in quart cartridges, 5 gallon pails, etc.?

Right now, Slab is available in 10.5 oz. standard caulking cartridges. However, please let us know if you'd like to see Slab in larger sizes. We're always happy to hear from our customers about their specific needs.

Does Slab contain a mildewcide?

Yes, Slab contains a pretty hefty dose of mildewcide to help prevent growth of mold and mildew on the surface of the caulk.

How do I clean up Slab that is still wet?

Soap and water will do the trick. Easy!

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

I applied Slab today and it's supposed to rain tomorrow. Do I need to cover it?

Yes, it would be best to cover Slab if you expect rain within 24 hours of application. Simply cover with a tarp or something similar to keep rain off of it.

I applied Slab yesterday and it's still soft. How long will it take for it to dry? Can I drive or walk on it yet?

Dry time will depend on how much Slab was applied, the temperature and humidity. Larger beads will take longer to cure, and cooler and more humid conditions will also extend the cure time. In ideal temps and humidity (less than 50% humidity and 70

I have tire tread marks on the Slab I just applied. How do I clean those off?

Soap and water should remove those tread marks from the Slab. You might need to use a nylon brush (the kind you use on dishes) to get at any stubborn spots.

I put Slab down on my driveway a few hours ago and didn't realize I'd need to get my car out of the garage. Now what?

Put some boards or plywood over the product and drive on that instead. Then be sure to avoid driving on it for at least 24 hours to allow it to cure.

I see that Slab has a cancer warning on the cartridge. Should I be concerned?

We use naturally occurring silica sand in Slab to give it texture (yes, the same sand you can find on the beach). A small portion of this sand has crystalline silica. It is the airborne, breathable portion of the crystalline silica that is considered a carcinogen. As long as you don't sand or grind the surface of the Slab material after it is cured without using proper respirator equipment, your exposure to any crystalline silica is less than it would be if you were to visit the beach.

I was a bit messy and got some Slab where I don't want it. Now it's dry. How do I remove it?

Try a citrus-based cleaner first. That should help loosen it up some. Then try scraping at it with a plastic scraper to loosen it more and pull it off. If that doesn't work, you can try mineral spirits to loosen it more.

Is Slab waterproof?

Once fully cured, yes. During early cure, be sure to protect it from heavy rains, as that could cause the product to washout.

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

Slab cracked! What happened, and how can I fix it?

If Slab cracked down the middle, that usually means either: a) the joint is now wider and it stressed the caulk too much or b) Slab may have been applied either too thin or too thick and isn't able to stretch properly. In either case, the fix is easy:

1. Use a razor blade to release any tension in the caulk. 2. Clean the joint with soap and water to remove dust, gravel, sand, etc. 3. Insert some of Sashco's Pre-Caulking Filler Rope (or similar), if some wasn't used before. 4. Apply more Slab over the filler rope, making sure it's sticking to the leftover product. Smooth the bead to ensure good adhesion.

If Slab is no longer sticking to the side of the joint, you'll need to cut it out and re-do it. That's usually caused by some sort of chemical that Slab won't stick to, or the substrate itself being weak. (This is common with asphalt or concrete that was poured in cold temps and wasn't able to properly cure itself.) It will help to sand down the sides of the joint with a wire brush to ensure any loose concrete is removed and the Slab will be sticking to a good, sound surface.

Slab is too dark for my concrete. What can I do to help it match better?

The color of Slab was chosen to match concrete that is aged and has darkened. If your concrete is newer, it may be darker than you need. Time will darken your concrete some so that Slab will eventually blend in. Until then, Slab is paintable. Feel free to paint over it with paints made specifically for concrete floors to get a better match.

The surface of my concrete is spalling. Can I use Slab to repair it?

No. Slab is not a good "glue" for spalling concrete. It would be best to remove the spalling or consider having a concrete contractor come out to fix it.

What are isocyanates? Why does it matter that Slab doesn't have them?

Isocyanates are highly toxic, both to breathe and to touch. Many concrete repair products contain them. Slab doesn't. So breathe easy, save the planet and fix your concrete cracks all at the same time.

What is Slab?

Slab is a 100% water-based acrylic latex caulk for concrete crack repair. Unlike other concrete repair products, it's not sticky and difficult to apply, nor does it dry hard and crack. Slab combines excellent adhesion and superior elasticity to result in a concrete crack repair that lasts.

Where should I use Slab vs. Sashco's Mor-Flexx

Slab is specifically made for horizontal concrete, brick and stone surfaces. It's specifically formulated to withstand heavy foot and vehicle traffic. As part of that, Slab shrinks more than Mor-Flexx and is design to be recessed below the surface, which helps with durability. Mor-Flexx is ideal for vertical applications: walls, around your chimney, brick, stucco and the like. It comes in a wide variety of colors to match all of those different surfaces, but isn't tough enough to handle foot and vehicle traffic. Mor-Flexx doesn't shrink nearly as much as Slab, remaining flush with the surface, which is the ideal aesthetic for a vertical surface where you need the repair to blend in.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.
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Through the Roof

Can Big Stretch be used on roof applications?

No. There is too much direct and extreme weather exposure. We recommend Sashco's Through the ROOF! instead.

Can I apply Through The Roof to wet surfaces?

Yes! Through the Roof can be applied to wet surfaces and has been found to work immediately when applied during a rain storm. Just be sure to use a stiff bristle paint brush, a metal trowel or foam brush to really work the product onto the surface, displacing all of the water. This will ensure the product will stick really well once all that water is gone. Through the Roof will take a bit longer than normal to cure when applied to a wet surface. It is NOT recommended for areas of continual submersion.

Can I apply your products when it is cold?

With our water based products, only if you can ensure a surface temp between 40 degrees F and 90 degrees F. This usually means you have to tent the walls and heat them. Lexel and Through the ROOF! can be applied down to 0 degrees F.

Can I use Through the Roof on my camper/RV?

Through the Roof!® is highly recommended for most surfaces on RV's/ Campers. It can be used on rubber roof membranes; however, while it will adhere as usual to the rubber membrane, it may ripple or warp the rubber membranes over time. Cosmetically, it may not look good, but the performance of the Through the Roof!® remains the same. Therefore, it's a good idea to test Through the Roof!® to make sure the final appearance will be acceptable. In addition, some RV's / Campers use polyethylene and polypropylene materials. Through the Roof!® will not stick to them, so keep your eye out.

Can I use Through the Roof to coat my entire roof? Can I paint a wall with it to protect it from moisture?

Through the Roof is not recommended to be used as a full roof or wall coating. Because it remains somewhat soft and flexible, it tends to attract dirt and debris which is cosmetically unattractive. Also, if it is on a roof that may be walked on, it may become sticky or tacky under the sun, causing you to stick to it. Conversely, in cold, wet or snowy weather, it may become slippery, making it unsafe to walk on.

Can I use Through the Roof to seal or waterproof canvas?

Yes. Through the Roof brush grade can be used to seal tears in canvas. It may also work to water-proof canvas. To waterproof canvas, dilute with some solvent (say 1 part solvent to 5 parts Through the Roof) and apply. In cold weather, the canvas would get a bit on the stiff side but it would not affect performance. And again Sashco can't guarantee performance as we have not done any official testing on this application.

Can you use Big Stretch on a mobile home or RV?

On a mobile home, yes. There are no substantial differences between mobile homes and conventional housing.

On an RV / motor homes, no. The non-porous materials often used & the type of direct movement and weather-exposure these vehicles experience often stress the Big Stretch too much. Lexel or Through The Roof would be better products to use for this application.

Does Through The Roof stick to most roofing materials?

Yes! Through The Roof will adhere to fiberglass / asphalt shingles, cedar shakes, plywood, water-based acrylic roof coatings, cement, slate and glazed tiles, asphalt roof cement, and many more. Refer to theThrough the Roof brochure for a more comprehensive list.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

How long will Through the Roof last? Does it come with a warranty?

Through the Roof comes with a limited lifetime warranty. Refer to warranty details Refer to warranty details on our website, on the product packaging or the Through the Roof brochure.

Is Through The Roof easy to clean up?

Yes! Tools may be cleaned with mineral spirits or paint thinner. We recommend cleaning hands with a citrus-based or waterless hand cleansers.

Is Through The Roof Waterproof?

Yes! Through The Roof is waterproof

My chinking or caulking is torn. How do I fix it?

Repairing torn chinking or caulking is really rather easy. First, use a razor knife to slit the chink or caulk line a bit further to release pressure on the bead. Then, clean the surface by wiping it down. Gun new chinking or caulking over the torn area (as long as you're using more of the same Sashco product),then smooth (tool) the new product, feathering it out onto the exisitng bead. If no backer rod was applied, you may need to cut out the torn area, install backer rod, and then follow the remaining steps as noted above.

On the average, what is the life expectancy of Through The Roof vs. asphalt?

In our testing, we've found Through the Roof to last at least 20 times longer. The testing is still going, so that is likely to go up.

What solvents does Through the Roof have in it?

Refer to the MSDS for more information.

What will happen if it rains shortly after I have applied Through the Roof?

Through the Roof can actually be applied to wet surfaces and has been found to work immediately when applied during a rain storm. If it gets wet during or shortly after application, it will simply take a bit longer than normal to cure. It is NOT recommended for areas of continual submersion.
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Windows & Doors

Are there products other than McKanica® to use in removing silicone?

There are several brands on the market. We have tested a few of them, and the McKanica® formula stood out as the best to remove a variety of silicone residues from the surface. If you cannot find the McKanica® product, try to find a caulk remover that contains both alcohol and a solvent such as mineral spirits. The combination of alcohol and solvents is more potent and effective.

Are your products compatible with other products?

Contact Customer Service at 1-800-767-5656. They can give you general information on chemical compatibility between Sashco's products and others.

Can Big Stretch be used as a glazing on windows?

A soft gooey "sticky" sealer such as a butyl caulk is needed for back bedding. We do not recommend any of our products be used as glazing or as a back-bedding.

Can I use Conceal on the interior of my home?

Yes! Be sure to follow all proper application instructions as outlined in the Conceal info sheet.

Can MildewFree be used as a glazing for windows?

No. Use a sealant specifically designed for window glazing or back bedding.

How do I maintain my chinking and caulking?

When installed properly according to directions, chinking and caulking don't take much in the way of maintenance. It is always good practice to check for any loss of adhesion or center tearing so that you can repair it immediately, preventing any water and insect infiltration in those areas. You may also want to periodically clean the surface for appearance's sake. You can clean your chinking and caulking lines with soap and water. Stubborn areas can be scrubbed with a nylon brush and water.

Is Big Stretch paintable?

Yes, Big Stretch is paintable within 4 hours with latex based paints, stains and primers and after 1 week with oil based paints, stains, and primers. Latex coatings are breathable and some are quite elastic, allowing the Big Stretch to continue to cure through it while maintaining a flexible film that won't crack.

Lower quality latex paints are seldom as elastic as Big Stretch and can crack while the caulk cures and shrinks. As such, it is best to let Big Stretch dry completely before painting with lower quality paints.

Some oil based products are not breathable, which can prevent the Big Stretch from curing properly. In addition, oil-based products are very rigid when cured and can crack over the very elastic Big Stretch as it goes through its curing. Waiting the full week to cover with oil-based products helps ensure that cracking will not happen.

Is your chinking / caulking supposed to stay "soft"?

Yes. All of our chinking and caulking products are formulated to retain their elasticity (or "softness") for many years.

What is the best way to remove Big Stretch?

It is not always necessary to remove Big Stretch. The surface can often be cleaned and the joint re-caulked

What will Big Stretch adhere to?

Big Stretch will adhere to most construction materials. Refer to theBig Stretch brochure for a more comprehensive list.

When do you use MildewFree vs. using Sashco's Lexel or Big Stretch?

Big Stretch is not recommended for use in bathrooms or kitchens, where there might be routine exposure to water. MildewFree and Lexel can be used in bathrooms and kitchens, but there are significant differences. MildewFree is water-based, and Lexel is solvent-based, so you can clean up tools, hands, etc. with MildewFree on them with water. Lexel will require solvents to clean up. MildewFree is easier to tool than Lexel, and has a flatter sheen to it. In addition, the colors of MildewFree have been matched to common kitchen and bath colors, and should blend into the joint a little more than Lexel, which is only available in clear or a bright white color.

Why do I have to use backer rod?

It's necessary in order to provide the proper joint design - caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.

Backer rod also greatly helps control the depth of the sealant as it is being installed to insure that the optimum amount of material is put into place. If too little material is installed, premature "cohesive failure" can occur. If too much is installed, the sealant is wasted and your costs are greatly increased.

Why does Big Stretch clear look white?

When Big Stretch® clear is first applied, it has a milky white appearance. Not to worry, though - as it dries, it turns clear.

Will Big Stretch help sound proof my home?

Sealing up cracks and cavities – like where the drywall meets the floor, around windows & doors, around electrical boxes, etc. – will always help reduce sound transmission in a home.  In addition, if a bead of Big Stretch is put on the wall studs prior to drywall installation, this can help further dampen sound transmission, as the sound waves will be bouncing off a much more elastic & soft material (the Big Stretch), rather than the hard stud wood.

Will Lexel help prevent air leaks in my home?

Yes! Lexel keeps the weather outside. It seals thresholds, sills, siding, vents, pipes and air conditioners. Lexel is also good for leaky air ducts which can heat up your walls instead of your living area. Use Lexel to permanently seal all connections.
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