A unique combination of marine silicone and polyurethane formulated especially for fiberglass. Offers fast-curing, low odor, high adhesion, non-sagging, non-corrosive, non-yellowing formula. Provides a durable, permanent, watertight seal for joints subject to structural movement. For above and below the waterline. Adheres tenaciously to metal, glass, wood, Lexan, ABS and other materials.