Do it Best Gap Fill Foam Sealant is a UL-classified solution for filling, air sealing, and insulating cracks and voids. The expanding foam takes the shape of gaps to form a durable, airtight, and water-resistant bond that helps eliminate unwanted airflow and reduce condensation. Tack-free in just 15 minutes and ready for trimming in 30 to 60 minutes, this foam is quick and easy to use. Each can comes with a dispensing straw and features all-directional dispensing for added convenience.