g-unit1111 :
Turb0Yoda :
Strip it down as far as possible
Sand all parts to remove finished
Primer
Paint it. I've heard automotive paint works nicely
Gloss.
Enjoy
Same goes for the metal brackets or would that be too much?
Up too you. If you want to paint them, follow that procedure, abet with instructions given on the cans and whatnot. You could use regular spray paint for metal but imho but it won't nearly as good as if you use automotive.
http://case-mods.linear1.org/case-mod-101-how-to-paint-your-computer-case-part-1/
That guy seems to know his stuff.
If you want to use plastidip for some reason, You would still have to sand it, but no primer needed.. I don't think so at any rate. It was MNPCTech I believe that put up that video and several painting videos on their youtube.