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Just a quick note as I was rereading your post, I've never seen 500 wet before, I goes from 400 to 600, but I'm in Canada and things may be different in the US, if they don't have 500 wet, get 600. 400 wet seems to be more aggressive than dry and base coat goes on thin. I like wet paper for my final sand it's messier on the floor but leaves a better finish on the car, easier to see any imperfections in the reflection as well.
Ray
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