A one-part, moisture-curing, commercial grade sealant. Specially formulated to provide a permanent, waterproof seal when filling exterior gaps, joints and cracks. This high performance sealant offers superior adhesion to a wide variety of substrates and remains permanently flexible. Paintable. 50 year durability guarantee. Meets or exceeds Federal Spec TT-S 00230C, Type II, Class A and ASTM C 920, Type S, Grade NS, Class 25. Ideal for use on shingles, gutters, chimneys, skylights, and ducts.