PU Marine Adhesive Sealant

This one-component polyurethane marine adhesive sealant provides both structural bonding and permanent waterproof sealing in a single product. Based on a UV-stabilized MS polymer or moisture-cure MDI-based PU chemistry, it is specifically formulated to withstand continuous water immersion, UV exposure, salt water, and fuel splash common in marine environments. Skin-over in 40–60 minutes at 23°C, full cure in 3–7 days depending on joint gap and humidity. Shore A hardness 40–55, elongation 300–450%, providing excellent accommodation of hull flexion and thermal movement. Tensile shear strength 4–8 MPa. Adheres to GRP, steel, aluminum, teak, and most marine substrates with appropriate primer where required. Overpaintable after 24 hours. Used for bonding deck fittings, portlight frames, hull-to-deck joints, through-hull fittings, and general seam sealing on vessels. Resistant to fuels, oils, bilge water, and antifouling paint solvents.