Reduce drafts and save energy with GREAT STUFF Gaps & Cracks Insulating Foam Sealant. This ready-to-use polyurethane insulating foam sealant expands to take the shape of gaps up to 1 (25mm) in diameter, creating a long-lasting, airtight and water-resistant seal. It is a simple, cost-effective solution to improve energy efficiency. Polyurethane-based insulating foam sealant that fills, air-seals, and insulates small gaps up to 1 (25mm) in diameter. Can be used in interior or exterior application and is tack-free in 5-15 minutes, trims in one hour. Forms a permanent weather-tight seal to minimize drafts and insect infestation and has exceptional adhesion to building materials. Cures as a cream-colored rigid foam; ease of application results from all-direction dispensing. Foam elasticity properties allow for movement and shifting within a structure.