There seems to be some personal preference with this...and whether you are using a metallic or solid colour.
Based on many recommendations from the auto body forums, I used 80-180-320-400. I was told if I was spraying metallic to finish with 600.
Seemed to work well for me. Used 80 grit to shape filler, then 180 to remove scratches in filler as well as initial blocking of epoxy and urethane primers, then when straight I sprayed more primer, blocked with 320 and 3M guide coat, then 400 and guide coat.
This was all dry sanding.
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Michael
1970 Oshawa built 1 option Judge. 24 year restoration/upgrade project finally finished!
1979 Trans Am - low-buck drag car project for when I retire
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