I talked with a guy at a show this spring that uses the Eastwood kit and an old oven. He had a bunch of sample stuff and it all looked great. I'll be having him do all of the coating for Bad Ast as I get parts done.
He said it is really dependant on prep and he bead blasts all of the pieces before coating and uses a degreaser of some kind. I didn't catch the name. But he said it works very well right out of the box...
Hope this helps a bit.