VALDERN RUST CONVERTER - 250 ml Bottle : This water based Rust Converter is a milky white latex coating that is applied to rusted metal to stop rust, protect the surface and act as a primer for the finish coat. Very little surface preparation is required before use. It will treat rust on cars, car chassis, boat keels, engines, BBQ, ... this list is endless ...even your garden gate, garden furniture, metal railings etc etc . If you have a rust to treat then you need Valdern Rust Converter. This product is self priming but for long term protection it is advisable to overcoat with a suitable water or solvent based midcoat or topcoat. Transforms rust to a sound surface in 15 minutes.