J-B Weld MarineWeld epoxy is a specially formulated 2-part epoxy cold weld system that provides long-lasting repairs to surfaces, such as aluminum, metal, composites, and fiberglass. It sets in 4 to 6 hours and is fully cured in under 24 hours. It's capable of being shaped, tapped, filed, sanded, and drilled and will retain its strength above or below the water's surface. J-B Weld MarineWeld epoxy is perfect for use on boats, personal watercraft, in/outboard engines, and deck and haul accessories.