3M™ Marine Adhesive Sealant 5200 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.
This high performance polyurethane adhesive/sealant becomes tack-free in 48 hours, cures completely in 5-7 days. Its strong seal retains strength above or below the water line, delivering excellent resistence to weathering and saltwater.
Consider using 5200 Fast Cure instead if the quickest possible cure rate is a consideration. It has slightly less tensile strength, but provides full cure in as little as 24 hours.