Rustoleum works GREAT for painting computer parts, comes out great. Just use some enamyl/acryllic based spray paints, will work fine. I would suggest lightly sanding it down to get it smooth and get any crap off of it that will make ugly bumps in your paint. Also dont do it in a shop. I painted my case side panels like that, and while I was letting it dry, dust and ****e got all up on it and made it look crappy. So while it was still wet I decided to sand it off, and it came out looking super cool. I brushed it off with a drill and a wire brush, and the steel it now brushed steel with a black undertone. Needless to say, I am MORE than pleased with the way it turned out!