My shop has a dedicated paint booth with ceiling and wall lights, water drain in the floor for wash down and wet sanding. I use a 3000cfm swamp cooler with commercial filter medium wrapped around it and rectangular holes cut in the aluminum garage door and wall on either side, again with commercial filter material. works great!
Wet sand with 400, then 600 then 1000 and you will end up with the suede look you want.
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