Hey guys. So Ive welded up all the holes and now its time to start smoothing out the body and prep it for paint. Now I know there is a right way and a...not so right way to prep a car for paint. The right way is to sand it down to bare metal, prime, and paint. But my car has about 4 coats of paint on it already and although I could strip all the paint off I've decided that I don't want to invest that kind of time into the Z and have the car off the road for that long. Instead I would rather just rough up the entire car, apply body filler where needed, and give the car a single stage paint job (white.)
My driver side door has a good size patch of bondo that I found when i was sanding the rivet holes along the side of the car. I started exploring with my sander to find where the bondo ends. So as you can see in the picture there are many little indentations. My question is can I apply bondo to just these spots? Or does the entire door have to be sanded to the metal, then apply bondo?