2k Black is no different to paint than any other kind of 2k solid, just make sure your prep is good. I don't really do much wet sanding but i would do all the dents you want to do, then sand it down with some 180, give it 4 good coats with high fill 2k primer, about 15 minutes flashoff between coats, i would then leave it alone for a week, let the primer sink back.
Then, if you were just wanting to prime it the once, i would block the car down with 320 then sand it down with 500. Get it all masked up blow it down, degrease it etc etc. when mixing your paint i would run with a 3:1 mixture at about 30% reducer (it all depends on your personal preference and how you paint) i would also be using just a normal hardener. When it comes time to paint tack off your whole car, then tack off your hands and your arms and your airline (you would be suprised on how much crap is on your airline and hands) Give the car one semi wet coat, let it flash off for about 5 minutes (being a big car you won't have to wait long) then give it one final nice wet coat. Make sure you watch how the paint is melting in and make sure you aren't getting any dry lines through your job. Also make sure you heat up the car before painting, this will reduce the amount of peel you will get through your job.
Its pretty easy mate, any idiot can pick up a gun and paint, its the professionals that know how to prep well and put the effort into a quality prep job. And to be honest you shouldn't have to buff your job, i don't know why people think that all 2k jobs need to be buffed....as soon as you sand and buff 2k you will always need to keep on top of it and keep it buffed, unless you flowcoat your job.
Here's an example of jobs that are off the gun.....
My commodore is just a quick shitty paint up that took me about 2 hours to prep, i pretty much just scotched the whole car down, bond coated it and painted it.
And this is my Pulsar that i did at work, this was a more thorough job, i shaved a few things and primed it, blocked it and painted it, only 2 coats of clear...nothing different to any other job we do, but the prep work is second to none, not a single ripple, the whole car is dead straight.