3M Marine Fast Cure 5200 Adhesive SealantThis high-performance polyurethane becomes tack free in one hour and fully cures in approximately 24 hours. The adhesive sealant is extremely strong, retains its strength above or below water line. Stays flexible too - allows for structural movement. Has excellent resistance to weathering and salt water. Stress caused by shock, vibration, swelling or shrinking is effectively absorbed. Check the bonding and sealing jobs this product can handle for you: fiberglass deck to fiberglass hull, wood to fiberglass, portholes and deck fittings, motors on fiberglass transoms, under mouldings, hull seams above and below water line. Center board trunk joints. Between struts and planking. Stern joints.