M-1 Marine is a moisture-cure marine-grade adhesive/sealant formulated for applications above or, post-cure, below the waterline. M-1 Marine is free of solvents and isocyanates, will not shrink upon curing or discolor from ultraviolet exposure, and will not bubble on damp surfaces. This sealant adheres to many surfaces without priming - including teak, fiberglass, vinyl, glass, FRP and metal. It forms a strong bond, yet remains resilient and flexible after cure.