I realize this is an old post, but if anyone is looking for an awesome FDE paint (a 3-stage process) there is a company on ebay called FDExpert (just search FDExpert on ebay), I have used the stuff and man is it excellent, paint and bonds to the surface very well.
Matches Magpul's FDE to a "T", and is recommended for airbrush application, but I hand painted my AR-15 and it looks awesome!!!
Highly recommended. I will try to get some photos posted soon.