Versachem Magnum Steel Epoxy Stick is a fast-curing, two-part epoxy putty stick that permanently repairs leaks, holes and cracks. Simply cut off the amount required for your application, knead until the product is a uniform color, and apply to your repair. It molds to any surface, and when fully cured, it can be drilled, filed, sanded and painted. For a smooth appearance, hand-rub the cured epoxy with water or damp cloth prior to hardening. Heat is generated when the putty cures, the more putty that is mixed together, the more heat that is generated, causing the epoxy mixture to cure faster. Only mix the amount of putty together that can be used within the handling time. Use it to repair pipes, tanks, radiators, couplings and more, it bonds copper, brass, steel, aluminum, iron, PVC, fiberglass, and concrete with a tensile strength of 1000 PSI. Water resistant formula dries to a dark gray color. Temperature Range: Dry 200F; Wet 125F.