ZPC doesn't cut that much if I remember from last summer. I would say 83 cut a bit more then ZPC but I can't tell you which one finishes the best, it's been too long since I used both. I know for sure both can finish nicely. ZPC has diminishing abrasive while 83 doesn't, which I would assume ZPC can finish better. ZPC dust a little if I remember right
and price per oz, you're better with 83
80 series from Megs is also good polishes to start with. 83 and 80 are fine polishes. Cheap, available everywhere and good learning curve on DA or rotary. Personally I would go with Megs polishes
hope it help and good luck. let us know how it turns out
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