Probably, what you are going to have do is soak the Aztec in gasoline for 12 hours.
Then; you have to be careful with this step for safety concerns; but you will need an external ignition source that you can throw at the container that holds the Aztec and gasoline. What this will do is ignite the gasoline and burn all of the paint out of the airbrush as well as melt the farce of a tool they call an airbrush.
From there, you can begin anew and repent your sins for buying that piece of crap. Next, you will want to contact a lawyer and work out a class action lawsuit against Testors for selling you a product that will never live up to your (or their) expectations.
Hope this helps