Filler
I am not a big fan of fillers, but I have used them on pitting and some small holes. If you go with a filler I would use a good quality such as "Professional" by Bondo in the gold can. It's real smooth and hardens real well. Bondo has come a long way since my days as a teen fixing the old junkers I use to drive. Since it is a side panel you can do most of the build up on the inside to give it a bit more strength. If you go the bondo method be sure to have a good bare surface and wear gloves. That stuff really sticks. I suggest a better panel but that is not always possible.
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