I'm working on doing mine black too. I've been working on this project for a WHILE so you can believe where I'm coming from. I've been through three brands of paint bondo, fiberglass, sanding, wetsanding the whole shit, I've finally found the best way to do it.
WITHOUT A DOUBT. All you need to do is clean the surface and paint it, not primer no sanding it's fucking beautiful. The paint combines chemically to the surface making it fill a nice color with less paint and no chipping. When using this paint, as with any paint job use several light coats of paint. There's no specific number. For paint use, I'll put it this way, the whole center piece that comes out of the dash is one of the hardest pieces to paint evenly becuase of the cup holder and cargo armrest and that took about 3/4 of the can. So that should be a nice benchmark. SEM also has a clear coat but the black looks really nice without it so I don't plan on using it. It's a project but with SEM it comes out really nice. Just make sure you clean the piece really well before you start painting it.
You don't have to sand it or anything because it bonds chemically, unless of course you end up getting a run because you added to much paint to fast. Another perk is the drying time, a coat of SEM dries completely in about 15-25 minutes. But give it overnight to cure before you reinstall everything.