Suitable in concrete and brick, metals, wood, painted surfaces, laminates, plastics and fiberglass This is a versatile two-part epoxy specially formulated for aquarium use like bonding corals and rocks When the two parts are mixed thoroughly together it adheres to most surfaces and cures even under water, without clouding, removing oxygen or altering the PH level of water and has been tested to be safe for marine life Resists temperature up to 120 degrees Celsius. Sets in approximately 30 minutes. Allow two and a half hours for curing. When cured, it can be drilled, filed, sanded and painted [ INSTRUCTION MANUAL IS INCLUDED IN THE PACKAGE ]