Steel Seal forms a low-tack protective skin which is moisture, salt, acid & fertiliser resistant Stops rust and corrosion, hermetically seals the surface Skin formed is self-healing Replaces cavity wax, fish oil, soft seal & protective wax Ideal for 4WD & Light Vehicle, body cavity, underbody & chassis rails Can also be used on trailers and caravans Lanotec Steel Seal is a high-performance corrosion inhibitor perfect for 4WD and light vehicle underbody and chassis rails, jet skis, trailers and caravans. It can also be used to treat vehicle body cavities to prevent rust and corrosion. It hermetically seals the surface with a low tack, self-healing protective skin. Only one light coat is required. The 400g can provides a spray to get into those hard to reach areas.