Interior plastics paint prep tips?

[Luke]

Not sure how most people do it but you can get a D/A (dual action) sander at harbor freight for like $20-30 and i would say like 1000 grit paper, I plan on doing this on my bumper plastics..just a suggestion as there may be better ways

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You'll be there for years trying to sand plastic smooth with 1000 grit paper.

Start with 180 and get it smooth then prime it and sand it with 320 and see how it looks, probably going to prime again. Then lightly sand them with 320 and get them close, finish in 600.