RE: K&B paint on plugs?
The type of paint and methods used are not as important as the finish. If your unsure, keep buffing!
I have used everything from Krylon rattle cans to aircraft grade epoxy primers, to high gloss automotive paint. all worked well. Just never try to use LusterKote, it peeled right off when I tried to buff it. Even after 12 hours post curing in the 100 degree Texas sun. The most important things are the glossy finish, a good quality wax (several coats), and a quality release agent (like PVA).