Combo pack helps remove rust and forms a barrier against it Developed by Boeing for use on aircraft, T-9 is a combination of solvents, lubricants, and waxes designed to penetrate, lubricate, and provide waterproof protection. Dries to a thin, waxy film that clings to metal. Rust Free removes rust and stains from steel, cast iron, stainless, fiberglass, chrome, tile, porcelain, concrete vinyl and cloth. Includes a 4oz. can of T-9 and a 4oz. bottle of Rust Free. 4oz. can of T-9 and a 4oz. bottle of Rust Free