How to fix a caulk bubble

Bubbles and blisters in caulk can be an eye sore. They won’t ruin your caulk job, but they just look ugly. Stick around to learn how to apply caulk, fix caulk bubbles, and keep your eyes feelin’ good.

Before you start, make sure you have more of the caulk you already used. That is, unless you used silicone…ugh, in which case, contact us and cancel your Saturday plans.

  • 1

    Gather tools

    You’ll need:

    • More of the caulk you already used. If you used silicone, you’ll have to start from the beginning. Ugh. So just don’t use silicone.
    • A utility knife to pop the blister
    • Foam brushes or your trusty finger for tooling.

  • 2

    Pop the bubble/blister

    Use the utility knife to pop that nasty blister (if it’s still fresh) or cut it out (if it’s dry).

    Step 1 cut out bubble

  • 3

    Apply more caulk

    As long as you used a Sashco product, or another product that will stick to itself, simply apply more to the area. Be sure to fill the hole if you had to cut out the bubble.

    Step 2 fill bubble

  • 4

    Smooth (tool) the new caulk

    Use your finger, a beading tool or foam brushes to smooth the new caulk so that it matches the rest of the caulk line (and doesn’t stick out like a sore thumb…or, ahem, a blister).

    Step 3 smooth bubble

  • 5

    Clean up

    Use soapy water* or mineral spirits** to clean up tools and surfaces. Sit down and relax. After all – you don’t want to get blisters.

    *for water-based products
    ** for solvent-based products

 Special Tip

Think “Goldilocks” when caulking: not too hot, not too cold, not too sunny. When applying caulk, you’re aiming for those “just right” conditions to get the best results.