3M 3 oz. Polyurethane Marine Adhesive Sealant

3M 3 oz. Polyurethane Marine Adhesive Sealant delivers high-strength, permanent bonding for demanding marine applications above and below the waterline. This one-component, moisture-curing polyurethane formula creates a tough, flexible, and rubbery waterproof seal on joints and boat hardware. It is engineered to adhere reliably to wood, gelcoat, and fiberglass. Designed to withstand harsh marine environments, this adhesive sealant absorbs vibration, swelling, shrinking, and shock without losing bond strength. The non-shrinking formulation provides extended working time and cures to handling strength in 48 hours, making it a dependable solution for marine repairs and installations.