I am taking the time to restore a set of aluminum slots for my roadrunner. Between sanding, wet sanding, polishing, taping and painting the inserts.. well they are taking a decent effort to get done. They are looking like a million bucks now, but I am concerned that if I don't clear coat them, they may re oxidize over time. Question I have is how long will they look great before they go down hill. Car would be a summer driver.