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here is a review
It says:
Available in three stages: Stripping (60, 80, & 100 grit),
Sanding (120, 150 & 180)
and Finishing (220, 320 & 400).

Great idea. A local paint store had some sanding sponges on clearance for 50c a piece. I'm going to go pick up a few and give it a try.

I wrapped the foam block that came with my micromesh kit...