750ml Polyurethane Spray Foam Insulation Soundproofing Heat Insulation Foam Sealant for Construction

Shaking is essential to thoroughly mix the liquid prepolymer with the propellant gas inside the can. This ensures a uniform foam with optimal expansion and adhesion properties. We recommend shaking vigorously for at least 30-40 seconds before each use. If you stop for more than a few minutes during application, shake again.

Yes, we strongly recommend it. Single-component PU foam cures by reacting with ambient moisture. Lightly spraying the surface with a fine mist of water before application will: Accelerate the curing process Improve foam adhesion Enhance the final foam cell structure and insulation performance Note: Do not apply on frozen surfaces or in sub-zero conditions.

Always hold the can with the valve pointing downward (upside down) during application. This ensures the propellant pushes out the entire contents of the can and prevents loss of pressure. Never use the can in an upright position.

Do not fill the gap completely - the foam expands significantly after application. As a general rule: Fill about 50%-60% of the cavity for standard applications If using a gun-grade foam (higher expansion), fill about 60%-70% Overfilling can lead to warping of door/window frames or excess waste. It's always better to apply in layers if a deep fill is needed.