Big Stretch is a high-performance water-based elastomeric sealant with powerful adhesion and superior elasticity. It spans gaps up to 2 inch wide and stretches up to 500% of original joint size without cracking. Big Stretch won't crack it just stretches. Stays soft and elastic over time for a years-long, lasting seal. Sticks, even to difficult surfaces. Compatible with a wide variety of building materials, including difficult ones 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. Paintable, Paint adheres like a pro, so go ahead and paint your wall bright blue.