It will easily get rid of scratches and swirls but the problem is you can end up adding micro swirls. Have to do it in levels and is tricky with black cause of the deepness of the shine.
Will have a chat with my mate. Thing is we haven't got a tool to test depth so if it's been done a lot before could go through paint!
Don't mind on mates van but it's on your head if your paint is too thin.
Done paint on a black Megane, green MX5, and a Scudo van recently and it all went well mind.
if im honest, i may get flamed, but never goto a car worrying about the thickness of the paint. the paint will be fine. the only problems you should be looking at is edges of wings/doors etc.
ive never ever burnt through the paint other than down a wing edge or 2 when i first started. i did do a small burn on a reversed dent of a van once which was virtually invisible. it was like something and been loaded into the van and it had dented it from the inside
only way you can burn through paint with a rotary is if you dont keep it flat, if you spin it too much of an angle the actual pad will do a nasty burn which more often than not cant be flatted out.
so dont worry about it.