J-B Weld WaterWeld Underwater Epoxy Putty Stick is a versatile two-part epoxy putty designed for strong, lasting repairs on various surfaces. It's ideal for household repairs, automotive, plumbing, marine, crafts, brick, concrete, and fiberglass applications. This putty can be used on damp surfaces and even underwater. Once mixed, it forms a permanent bond that can be shaped, tapped, filed, sanded, and drilled after curing. It sets in 6 minutes and fully cures in 4-6 hours, with a functional cure time of 20-30 minutes. The cured product is dark grey and rated at a tensile strength of 3127 PSI, withstanding temperatures up to 300ºF. Each stick contains 57g (2 Oz) of material.