When applied to rusted surfaces, it resists/retards rust in chemical change on drying to a tough, hard surface ready for priming. A paint job will last longer after an application of OSPHO because subsequent paint coating securely attaches itself so that moisture and oxygen normally do not attack the metal. OSPHO is water-thin, can cover a larger area than paint, and goes on easily. It is equally effective for exterior and interior work alike. NEW METALS - For new metals: remove dirt, grease, or oil; apply OSPHO, let dry overnight, then paint.
OSPHO can also be used on Galvanized, Aluminum to etch the metal and provide a sound base for painting.
Resists/retards rust - provides a sound base for paint
OSPHO is a rust-inhibiting coating - not a paint
Quart. Skybryte Co