Easy to apply with manual caulking gun. Remains workable with trowel or spatula up to four hours after application. Won't sag or flow in vertical or horizontal seams. Effectively absorbs stress caused by shock, vibration, swelling and shrinking. This product can handle these bonding and sealing jobs: fiberglass deck to fiberglass hull, wood to fiberglass, portholes and deck fittings, motors on fiberglass transoms, under moldings, hull seams above and below the water line. Center board trunk joints. May also be used, between struts and planking, in stern joints, on deck housing, etc. 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 resistance to weathering and saltwater.