I have been using Createx for several years to apply logos to my kites (Badger fabric paint also works well). I got bored cutting Frisket so I went to a print shop and got them to run me off a length of laminating material that I used to cut a permanent template. I spray the back of the template with SprayMount and then, once it has dried enough, stick it to the ripstop. Do the airbrushing, and as soon as the paint is dry, remove the mask VERY carefully. Finally, I iron on the paint using a sheet of silicone paper (baking parchment) on top. Use a cool iron that will not scorch or melt the fabric (test a scrap first). A light coat of paint does not seem to come off but a thick one will.
Good luck.
Roy Menage
http://www.gofirecrest.com