What I would do is lightly sand the finish with 1,000 and paint over the existing paint. I have had a lot of success with Duplicolor spray paint. It is sold in Autozones in a bunch of colors. It is acrylic lacquer and dries good enough to sand after a few hours. I would also buy a can of clear coat while at autozone.
The trick I have used with success is to spray about three or four color coats. (Spray a coat, let it dry, wetsand with 1,000 grit sandpaper until it is smooth, spray again...) After the fourth coat, I begin spraying clear. Wet sand after each coat of clear. The goal is to get it to look flat, almost matt finish. If you see little flecks of clear, sand more until it is all flat. Spray another coat of clear and repeat. After three or four coats of clear you can start upping from 1,000 (which you should have done after each coat) to 1,500, 2,000, 2,500, and then 3,000. I use a little bowl of water and do little circles of each type of sandpaper. Remember to rinse it every so often to get the gunk out of the sandpaper. After you go all the way to 3,000 and it is nice and smooth, buff it with polishing compound. That will change the matt finish back to shiney. If you see swirls, keep using the polishing compound. It will take them out. A decient finish should take about a week. (The sandpaper, paint, and polishing compound were at autozone.)
If you are set on using Nito paint, re-ranch is a good place to get paint. The thing with nito is it takes longer to dry. I have heard and found to be true that you can tell nitro is dry when it stops releasing the paint smell.
The body below I finished using duplicolor car paint from Autozone.
DSC03172 by Hentai No Baka, on Flickr
DSC03171 by Hentai No Baka, on Flickr
Good luck!
