Rust Remover, 250ml is a powerful de ruster, used on steel tanks before coating with Sureseal. You will also need to order a 100g bag of De-Ox, which is used to prevent flash rusting. Tank must be coated with Sureseal as soon as possible, to prevent re rusting.
Care must be taken when using on chrome tanks, as can stain. May be better to use De-Ox 250g only if in doubt.