First sandblast or beadblast. Second wipe off with parts cleaner real good, dry with compressed air. The more light coats of primer the better. Leave 20 minutes in between each coat of primer. Wait a day, light coats of paint of choice, wait 30 minutes on last coat before clearing. If your using rattle can good luck, I just did my whole rear skid, sandblasted, and had my buddy(painter at my work) only way it would come smooth was to wet sand in between each coat, plus we baked it so it turned out like a cars paint. If there not rusted and look fine whatever color they are, your best bet would be to leave it or have it powdercoated or painted professionally IMO... good luck
Back in the Game!