I don't know why you all grind these cars down like that. Use paint stripper for paint and bondo removal. You will see all repairs and grinder marks. . Stripper, Razor scraper, with a box of new blades and steel wool. DA the car with 80 when done to locate dents. You can see the dark crease in the one quarter that showed up with the DA. You get a much better platform to start with. Lines stay crisp.