I've just powdercoated my frame in a colour called Phantom Black which is like satin black.
We have a powdercoating area at work so they sorted it out for me.
What they did with my frame was heated it up before it was coated so that the powder sticks to it better and gets in all the little nooks and crannys.
Makes it look trick.
One word of advice would be to tape up everything you don't want powder on i.e any thing where to bits move on each other. Also make sure you order the bearings you need before you start.............one bearing in the swingarm is an odd size and a honda only part..............EX JAPAN............and not cheap