Rust prevention is the easiest way to keep sheet metal in top condition. Constant inspections and attention to detail are necessary for keeping metal in good condition. Areas where water can be trapped and bubbles are allowed form will likely reveal small rusty holes beneath the surface. Salt is an excellent rust accelerator and should be washed off sheet metal as frequently as possible. Coating sheet metal with a good rust-resistant primer and topcoat will help prevent corrosion from forming.