I find it interesting to learn how others work. I was just wondering what everyone uses to mix body filler on.
I have a scrap of granite countertop sitting on a cart with wheels. When it’s to the point that body filler is getting hard to scrape off, I sand it with 600 to get the old filler off. Then I use 1200 followed by 1500 and then I buff it out with a wool pad at about 1500, 1800 rpm to make it look new again.