I agree w Famas , Just want to add something. Krylon makes a good plastic bond spray paint. Use that as your base coat after you sand and clean your case. Clean the whole psp with some alcohol based solution right b4 you paint. Good prep makes for great paint. If you have the tools like a hvlp spray gun and compressor, catalyzed clear coat offers the best protection for your psp finish. But you gotta work fast.
1 more tip for painting , start out very light coats and build up to heavier. Last coat of clear should be almost ready to run. this helps the paint lay down flat. Be patient , wait in between coats.