The Plastic is painted (as correct you cannot powder coat plastic, as it will not stand the 450F temps, plus the powder won't cling, since the plastic can't be grounded).
Yes I wet sanded the powder coat just like you'd wet sand a car, only since the powder coat is 10X tougher than paint, it takes ALOT longer... and is quite tiring, but you end up with a mirror finish. I started with 400 grit , and worked my way up to 2000 grit, then buffed it with my makita polisher, and some special compound I use to buff out cars.
As far as powder coating getting in the threads of holes, and on bolts etc, yes it's a problem, and I either plug the holes with special plugs that'll take the heat, or I just run a tap through them when i'm finished.
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