LOCTITE® SF 7500™ is a non-toxic, aqueous liquid which dries at room temperature. It converts rust into a black, stable complex and forms a protective coating on exposed iron and steel surfaces. This product forms a suitable primer for most types of paints. It is good for all ferrous substrates. LOCTITE® SF 7500™ applications include converting areas of rust on metal pipes, valves, fittings, storage tanks, fences, guard rails, conveyors, supports, heavy automotive equipment, overhead cranes, booms, agricultural equipment, etc.