Ospho Rust Treatment - 2 SizesOSPHO is a balanced formula of Phosphoric Acid, Dichromats, Wetting Agents and Extenders. Ospho is environmentally safe and non flammable. OSPHO seals out moisture and prevents future rust from forming. OSPHO can be applied to just about any rusted or steel surface including: Vehicles, Trailers, Fences, Iron Railings, Sheet Metal, Outside Tanks, Lawn & Farm Equipment, Marin Applications and more. OSPHO is primarily used for bars metal applications but