The unique gel formula clings to metal surfaces for added convenience. The Must for Rust Gel quickly penetrates into every void of the surface to dissolve rust through chemical action. Then, it leaves behind rust-inhibiting crystals to resist future rusting. • Removes and prevents rust in one step• Unique gel formula clings to metal surfaces• Creates an ideal surface for painting / priming• Works Fast• Protects bare metal for up to 12 months• Water-based For Best Results Remove oil and grease from the metal to be treated prior to use.