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Hotrod, Ditto on ALL rust is bad! The best thing for that area is to sandblast the seam. Then (assuming you don't have any holes show up) is to run masking tape (a couple layers) just where the rolled edge starts into the seam (covering the seam & the metal on the other side of the seam) & swipe body filler in the pits. Once your done with the one side of the seam, tape up the other side & do that side. When your done you will have the pits filled, but not the seam. If you don't understand my babbling, just say so. Spray with etching or epoxy primer then apply seam sealer. Lorne