Nice flames-
BUT I do them the oppisite way. I cut out my flame masks with automotive masking tape or vinal tape. I do a reverse flame or what yours is. Instead of masking of the accual flame I make a outline mask.
Here is what I do-
I paint my body color first, then after the paint is dry I lay some tape over the body of where I want the flames and sketch out the outline of the flames on the body itself to figure out where the curves and whatnot will be in coraspondence with the flame licks. Next I cut them out on a piece of glass from a picture frame. This gives me the best surface to use since my masking tape wil stick to the glass firm enough to cut out the design yet I can still peel it off with no problems.
I leave the accual "flames" on the glass and take the surrounding tape that I cut the flames from. Sort of a negitive in stead of a positive. I carefully lay this back on my car and tape off the rest of the car to where the only thing exposed is the area where the flames will be. You get the same effect as mentioned before but now the flames can be painted more realistic with colors added and so on.
I paint on light coat of the body color over the flame area first to seal off any small creases I might have missed, then paint my flames. Once dry (about 30 min. using oil based paint-lacquer will take about 5 minutes) I remove the tape and its done-clear coat and polish!!
I wish I had some photos to show you guys what I mean, maybe this weekend when the weather is nice I will do a flame job andd take some photos.
Scott