Easy to apply with a 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 waterline. Centerboard 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 waterline, delivering excellent resistance to weathering and saltwater.

Product Specs:

• Tack-free: 30 hours
• Tensile strength: 700 psi
• Shore A hardness: 68
• Elongation: 750%
• Overlap shear strength for Gelcoat (70F): 519 psi
• Forms permanent bonds
• Excellent resistance to weathering and saltwater
• Non-shrinking
• Do not use in high-temperature applications (over 190F)
• Not recommended for the installation of glass, polycarbonate or acrylic windows unless they are also mechanically fastened
• Prime metal surfaces before using
• 3M Part# 05504
• Color: Black
• 10 oz. Cartridge