Don't know whether you want the mag for show, but mag and mag alloy are used for some aircraft applications like gearbox casings etc. Every part of the surface finish must be protected as mag corrodes very quickly and violently weakening the structure. Aircraft applications first degrease then use an etch primer coat to bond to the metal surface. This is followed by epoxy primer then top coat i.e. colour. I've never heard of powder coating mags, but that doesn't mean it cannot be done. Hope this helps /ubbthreads/images/graemlins/wink.gif.
