Keep your metal surfaces looking fresh and protected with OSPHO Gal Rust Primer. This rust-inhibiting coating works its magic by transforming rust into a tough iron phosphate layer, ideal for new ferrous or aluminum metals in both indoor and outdoor settings. Perfect for prepping surfaces before applying oil-based primers and paints, this primer covers about 600 Sq. Ft. per gallon, ensuring your projects go a long way. Remember to allow overnight drying time before adding the finishing touch!