Not to dispute what you are saying Mike, I certainly have used shelf paper, I have also used high quality tracing paper with rubber cement. The best thing about Frisket paper is that it is SO much easier to cut cleanly with a light touch. It is consistant and reliable. Again use what works for you, but for me, the real deal is Frisket paper, I use the stuff I get from Spokane Art Supply (I think they have a web site ) its in a roll, I use a sharp #11 blade and you basically just have to drag the blade over it using the weight of the knife to cut it. It has never reacted with any paint I use over it.
FWIW, I do some custom airbrush on helmets bikes and cars.
I have all my AMA numbers cut by the local shop on Gerber Mask.