I use it all the time. Whenever I want to resurface the cover, I start at 220 grit and work up gradually to the desired surface, which is usually at least 800 grit wet sanded.
Beyond that, though I will switch to abralon pads, which can go to 4000 grit and they do a great job.
I good spinner and lots of water and speed changes can really fine-tune the reaction of the ball.
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notclay