WATERWELD: Plugs or seals leaks, holes and cracks in almost anything. Repairs plumbing, fuel tanks, tub and shower, drains, pool and spa, boats & potable water tanks; setup occurs even under water. Helps to make repairs in moist applications and underwater applications12000 psi compressive strengthAdheres to a variety of surfaces including fiberglass, PVC plastic, copper, iron and aluminumCan be drilled, sanded, filed, tapped, machined and paintedCan be drilled, sanded, filed, tapped, machined, and paintedNontoxic and approved by the National Sanitation Foundation for use with potable water300 degrees F maximum intermittent temperature250 degrees F maximum continuous temperature1000 psi lap shear tensile strength