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, creating a long-lasting, airtight and water-resistant seal. It is a simple, cost-effective solution to improve energy efficiency. Expands to fill, seal, and insulate gaps up to 1 inch (25mm). Forms a long-lasting, airtight, weather-resistant seal and helps to keep insects, moisture/condensation and allergens out. Adheres to most construction materials.