This year my Christmas present to myself was a powder coating machine from these guys http://www.electrostaticmagic.co.uk/, I saw them at the shows last year and again I stood and watched while he coated some steel plate on the stand on Saturday.
I'd been holding off buying one as I seemed to be doing ok with spray paints on the metal bits of the Midas while I rebuilt it, I wish I hadn't waited now as the finish you get with this gear is excellent. My first little project was the painted alloy rocker cover which seems to shed paint like there's no tomorrow, the results are near professional in appearance and the coating certainly seems tough.
On first impressions I'd recommend one of these to anyone needing to coat clean metal reliably.
Rich