Big Stretch is a high-performance water-based elastomeric sealant with powerful adhesion and superior elasticity. It spans gaps up to 2 inches wide and stretches up to 500% of original joint size without cracking. Big Stretch wont crack, it just stretches. Moves when your home moves to create a permanently waterproof and weatherproof seal. Helps you avoid repeated repairs. Just say no to brittle, cracked caulking. Stays soft and elastic over time for a long-lasting seal. Sticks, even to difficult surfaces. Compatible with a wide variety of building materials, including difficult surfaces like vinyl windows and siding. No need to search for a product specific to every different surface. Professional looking results every time. The smooth formula is easy to apply, even for a novice.