How To Use Great Stuff Gaps And Cracks [best] Jun 2026

This foam cures by reacting with moisture in the air (and on surfaces). If you are applying it in an incredibly dry environment, a light mist of water will help it cure faster.

However, as simple as "point and shoot" sounds, there is a right way and a wrong way to use this expanding foam. Used incorrectly, you end up with a sticky mess on your hands, warped window frames, and wasted money. Used correctly, it lowers your energy bills, keeps critters out, and waterproofs your home. how to use great stuff gaps and cracks

Gaps & Cracks expands roughly 50% to fill the void. (Note: If you need less expansion to avoid bowing delicate materials, look for GREAT STUFF™ Window & Door, which expands less aggressively). This foam cures by reacting with moisture in