Bostik® Marine 920 is a one part, gun grade urethane sealant/adhesive that moisture cures to an extremely tough, resilient seal which exhibits excellent tear and abrasion resistance while retaining permanent elastomeric properties. It has tenacious adhesion to most common marine substrates including virtually all woods, metal, FRP and most plastics. Bostik 920 can be used as either an adhesive or as a sealant. Below-above waterline use.