I had a rusted out old Acura for a few years, and there are a couple of ways to deal with body rust. If the rust hasn't gotten into the body, AT ALL, then you'd be best buying a can of auto spray (you can find it at Napa, Autozone, neighborhood hardware stores) that converts rust to primer, then using the touch-up and clear coat. If the rust has started to go into the body (more than about 1/16 of an inch), then it'd be a good idea to sand the side down a bit, put on some Naval Jelly, wipe clean, sand again to get rid of the debris, then apply a couple of thin layers of fiberglass filler, sanding between coats, THEN priming the surface and painting it over with the touch-up.
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