I accidentally hit my driveway with my PGM v2. Now there are two rough spots, one on each half. What grit sandpaper should I use to smooth the rough spots out? Thanks. 
Fine grid sand paper. 
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Start at a really rough grit and work up to about 1000.
If you just want to get the spots out, start at 1000 and gogogogogo.
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1000 would be great for metal but it’s too fine for plastic.
I’d try maybe 400.
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