CombiColor Metal paint should be applied on bare, manually derusted or with CombiPrimer Anti-Corrosion 3369/3380 primed steel. CombiColor Metal is intended for brush and roller application and can also be applied by air spray. For metal structures in a more aggressive industrial environment, prior application of a Rust-Oleum® CombiPrimer Anti-Corrosion 3369/3380 is recommended.