My daughter backed my bmw into a stone wall and caused some deep scratches in the rear bumper side. I have read that bondo isn't appropriate for filling in. Could someone suggest appropriate filler and any other tips for this repair?
I can't really answer your question.
What you want to look for is somebody that works at one of your local, reputable body shops. Sometimes those people do work on the side out of their own garage. That's going to be your most economical method of getting a quality repair.
This method may work for you if you're ok with it never being perfect as new: https://www.youtube.com/watch?v=S2aC_oseMe4
If that's not the case, you would have to have the whole thing resprayed at a shop - not going to be cheap to get it done right.
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