is powder coat really the best way to go? I have had GREAT luck with media blast, catalyzed Dupont Variprime (or PPG epoxy primer) followed by normal single stage urethane flat black. Of course, this is on a car that is maxed out at 125mph, only gets driven 1-2k miles a year, no snow, no salt, and rarely on dirt and gravel roads.
If I were to powder coat, I'd feel a heck of a lot better if there were a way to apply a anti-corrosion spray on coating first (zinc rich catalyzed primer or whatever is the new equivalent that is for sale everywhere but California).
I say all this because I had a set of 2 piece basket weaves (E39) that were restored and powder coated. As soon as one suffered a very very small nick, water immediately got under the powder coat. This caused the PC to separate in significant sheets, and within a year it needed to be redone. I spray coating with lower film strength but perhaps higher adhesion might have ended up being more durable because it wouldn't trap moisture underneath any small breaches in the film.
YMMV
John