This is what I use since I don't have air for an Air Advantage. Almost the same but made by 3M. I start with a 1500 clear coat disc and move to a 3000 Trizact disc before buffing. If a lot of orange peel then would go a lot coarser with my paper using it wet with this tool.
just my 2 cents. I shoot heavy, also i uses a sata gun. This is what i do, ill add reducer to it, not alot just a tad (spray panels would be a good idea before painting the whole thing) do a light mist, to tack it, and then 2-3 heavy coats. takes practice. iv seen alot of good advice on this thread also.