Your re-coated headers look nice, Bluestreak! I think it's important to note, however, that if your location is Florida, that is a world of difference from Illinois. If the car is a DD in Illinois, or even driven occasionally in an Illionois winter, there will be no way to stop any headers from rusting unless they are stainless. OP, I would advise your friend to go buy a pair of stainless headers and sell his painted ones. I wouldn't spend the extra money to coat them, IMO. By the time you are done fooling with them, you will have spent half of the money you would've if you had just bought stainless, and you will still be buying headers again after a while. Unless, of course, your friend doesn't care about the headers looking badly after the first winter and having to buy another pair again at some point. Hope this helps.
Scott