Big Stretch 10020 Acrylic Caulk, Ironstone, -30 to 250 deg F, 10.5 oz Cartridge

Big Stretch is a high-performance water-based elastomeric sealant with powerful adhesion and excellent elasticity. It spans gaps up to 2 in wide and stretches up to 500% of original joint size without cracking. Big Stretch won't crack, it just stretches.