I used brute force with a poorly, completely erroneously tuned scraper. I layered the bondo thick last coat, and do not recommend this. My thinking was that I'd rather remove from a solid base than have to add a little later. But it was ugly with a dull scraper. I have to stop into a motor shop and get a wrist pin or lifter. Took pages and pages of sites to not know what to do. Why is that? But now until now I am back into r.w do I know how to do it. Before getting the scraper I used a sander and it was like killing a fly with a hammer. Had 2 coats of primer. Now I'm gonna oil primer again, shellac ( to eliminate pinkness), then oil paint. I have put a solid swath of red Bondo glazing putty over the pink Bondo with hardener on each of the ~140 holes, enough so shrinkage is not gonna be a prob. Much easier to sand. There was an issue of how much I scraped over the holes, pinching the inner bondo circle with the scraper, , &/or how much power sanding, creating a furry ridge around the circle.
Is there any problem with this sequence:? "bondo" w/ hardener glazing putty ("Bondo") shellac oil prime oil paint
I am thinking, the reason for the shellac is to hold down the pinkness, but the question, I am worrying is about compatibility.