Bassjudge,
Yes, some claim to have sprayed Devcon through their airbrush. They say it works. Do a search on spraying devcon. I have a post somewhere on here where someone said that they did it and I kinda challenged what it would take to do it. They said that I was corrrect. Bottom line is.... you can, but you better be quick and thorough at cleaning your gun. You will only have about 12 min. to mix, shoot and clean before it will become a real chore to get it out of your gun before it starts to harden. Personally, I would not recommend it.
Skeeter