The Stovebolt Site Forums The Shop Area Paint and Body Shop Dura blocks and what grit sand paper?

You can use 80, 180 or 320 on the long blocks. You can use 800 on the primer but deoending on how thick it is, ou may be there a while. Sand the primer with 180 to remove the previous sand scratches and then primer the part again. Then watersand the primered parts with 400 wet/dry sand paper. You will get a very smooth paintable surface without any sand scratches.