Sorry I misunderstood. Yes, get the goop off and grind what you can. With the lap welded solid top and bottom, thinning isn’t as much of a problem if you stay on the weld when grinding. For minor filling in under car areas, I use Fiberglas filler. Mixes like bondo but is waterproof and then sand and paint over. I’ve never had a problem with rust using that underneath a car or around wheel arches. I don’t recall the brand name but it has small fibres in it.
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