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 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 doors, windows, sidings, ducts and vents.