Reduce drafts and save energy with Great Stuff Smart Dispenser 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. Comes with the new Smart Dispenser Straw for no drips, and less mess - foam stops where you stop. Reusable for up to 30 days - use again and again with precise, greater control. Tack-free in 5-15 minutes, and trims in one hour.