GREAT STUFF Gaps & Cracks is a polyurethane-based insulating foam sealant that fills, air-seals and insulates small gaps (up to 1 inch) inside or out. But you probably guessed as much from the name. What you might not have guessed is how easy it is to use (thanks to the straw applicator) or how it expands to take the shape of cracks and voids to form a durable, airtight, and water-resistant bond that eliminates unwanted airflow and helps reduce condensation. FILL GAPS & CRACKS. This ready-to-use, minimal-expansion insulating gap filler expands up to 1″ inch to take the shape of gaps, creating a long-lasting, airtight and water-resistant seal around plumbing and electrical, in basements, attics and more.STRAW-APPLIED. Save time on your projects with this simple to use spray foam — the straw applicator makes any project a breeze and helps you deliver the right amount of insulating foam even in hard to reach spaces.SPRAY ANYWHERE. Tackle a variety of projects with exceptional adhesion to building materials on both the interior and exterior of your home. Adheres to wood, metal, masonry, glass and most plastics.QUICK-CURE. Stop waiting around and keep the pace of your projects on target. This foam sealant dries tack-free in 20 minutes and cures rigid for trimming in 1 hour. Trim, sand, stain and paint for a truly GREAT finish to your projects.FILL MORE GAPS. Get the job done right the first time with this cost-effective bulk case of polyurethane foam crack filler from GREAT STUFF. Includes a 4-count of 12 oz. cans, each with dispensing straws to cover all your gaps and cracks.