3M, 1-10 gal cartridge, white, polyurethane, 5200 marine adhesive-sealant, bonds, seals fiberglass and most woods, tack free in 48 hours, completely cures in 5 to 7 days with no shrinkage, applies smoothly and evenly, does not sag or flow in vertical or horizontal seams, retains strength above or below water lines, excellent resistance to weathering & salt water.