MildewFree Sealant*

  • HOW TOs
  • MildewFree Bathroom 01

    This bathtub and shower are sealed with MildewFree.

    No one likes mildew. It stinks, looks bad, and it’s not good for your health. Now, you can make mildewy caulk in your kitchen or bathroom a thing of the past with MildewFree* mildew-resistant sealant. This super-flexible sealant prevents mildew from growing on it year after year. MildewFree is hopped up on super doses of environmentally-safe mildewcides that keep the ugly mildew monster at bay for at least seven years. If it doesn’t, we’ll pay to have someone come out and replace it for you.

    You can use MildewFree* all around your house, including:

    • Kitchen & bathroom fixtures
    • Shower surrounds, bathtubs, toilets
    • For resetting tiles
    • Back splashes & sinks

    It adheres to most building materials, including:


    • Aluminum • Brass • Steel


    • ABS • Nylon • PVC • Acrylic Sheet • Plexiglass • Urethane • Fiberglass • Polycarbonate • Vinyl • Lexan®* • Polystyrene

    Other Surfaces

    • Marble • Slate • Stone • Brick • Granite • Stucco • Cinder Block • Formica®* • Tile • Concrete • Glass • Wood • Corian®* • Drywall • Mortar

    Don’t see your surface listed? Contact us and ask us if it’s OK.

    Where Not to Use:

    • Areas of water submersion or frequent, prolonged puddling such as drains, pools, hot tubs or saunas
    • On copper (it will discolor it). Use Sashco’s Lexel® instead.
    • Will not adhere to or is incompatible with polypropylene, waxes, polyethylene, Teflon®, and silicone


    *Teflon®, Lexan®, Formica®,  and Corian® are registered trademarks of their respective owners.

    In this video, Andy, a Chemist at Sashco, shows you how to remove old caulk and apply MildewFree around your bathtub.

Photo Gallery


  • 7-year replacement warranty, including labor costs
  • Maintains a watertight seal
  • Scrubbable – won’t get damaged by abrasive cleaners, bleaches and other common household cleaners
  • Elastomeric with powerful adhesion – Won’t pull away or crack
  • Stretches and stays flexible
  • Low VOC
  • Paintable
  • Water clean-up

*Cured sealant is mildew resistant. 7 year guarantee: MildewFree Sealant* is guaranteed for 7 years to prevent mildew growth on the sealant. If mildew growth occurs on the sealant (not on soap film)**, within 7 years of purchase, Sashco will replace the product and provide a contractor for reinstallation. Proof of purchase is required. Warranty applies to single family residential use only. No other warranties expressed or implied.

**Note: clean regularly to prevent soap film build up and mildew growth on soap film.