Over the weekend, I noticed that one of my worst nightmares (car-related, anyways) has started coming true. I have a very slight amount of rust starting on my rear bumper. It is a scratch only a few hairs wide, and maybe a millimeter or two in length, but I want to eliminate it as soon as possible. I was thinking of just using something like Naval Jelly on it, then brushing a little clear coat over the exposed steel. Anyone else have any tips on keeping the rust from spreading, while not having to do any major work to the whole bumper?