I nitromored mine so it had no paint on, then degreased loads. I used some hammerite blue aerosol paint from halfords, as it looked somewhere like the proper blue! It was on a spare cam cover so was just an experiment that turned out much better than expected!
All i did was spray the entire thing...

and then got a scraper with a stanley blade in and just went over the parts i didnt want paint on. It came off all in one lump.




Then i polished up the parts i scraped with abit of metal polish and it looked brand new. no pics of that though, cant seem to find them.