3m 5200 Polyurethane Adhesive/sealant Adhesive/sealant, Mahogany, 10oz. . Tenacious bonds and watertight seals above or below waterline Provides exceptionally strong adhesion, yet stays flexible after it cures; may be used above or below the waterline. Ideal for underwater thru-hull fittings, hull-to-deck joints, portholes and bonding woo...