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I know you don't want to get into a big job, but I would mask off the belt moulding, sand that area, treat it with OSPHO to kill the rust, and refinish. If your car is finished in acrylic lacquer then it should be easy to blend in the repair.
OH, wait a minute! My 29 tudor has the same problem. But in my case it is just one symptom of a pretty crappy paint job with lots of other faults. I am refinishing the whole car.