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My take on this if you can't weld them would be to indent the holes a little then use something like panel adhesive to fill the holes first prior to plastic filler. This is if the area isn't low already, like trim holes. Being it is dented already the area may be a little low after pulling and you can apply it past just the hole. You can get small tubes adhesive from 3m I believe where a gun to apply isn't needed. You don't want it just adhering to the hole only. Fiberglass filler would be my second choice. The stud welders are a good investment, as well as a small welder. I've gotten plenty of use out of mine. I don't miss drilling holes for dent pullers or pull rods.
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