What Fibonachu said, but you may want to remove the bondo as well. I got a replacement fender that had some up near the headlight. I removed it down to bare metal and fixed the distorted part with hammer and dolly, I don't think that area will need more that a skim of filler or maybe just some high build primer.

You can check for bondo with a magnet. If there is very much the magnet won't stick to the surface.

If the paint is well adhered you can just sand it to feather edges and primer and paint over it.


Kevin
1951 Chevy 3100 work truck
Follow this saga in Project Journal
Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.