Repco Rust Inhibitor is a heavy duty wax coating for rust and corrosion prevention. It dries to a flexible, non sticky, water repellent film. Designed for use on concealed internal surfaces of cars, trucks, trailers, caravans, 4 wheel drive and off road vehicles, tractors and farm machinery, equipment and tools. It will inhibit the formation of rust inside inrternal box sections, chassis, door cavities, sills, side panels and pillars.