If you live in a salt air area or any are where rusting would be a problem, the best is to use a powder coating. It need to sandblast first to bare metal and brush on primer in a good thick coat. It can be topcoated with a powder color of your choice. For chassis’ we recommend to powder coat with semigloss rustoleum. Any small scratch through the coat and the powder below will oxidize and seal the scratch. Even with larger scratches, the rust will not get under the powder coat.