Apply diluted white (Elmer's) glue to the base, then sprinkle the dirt over it. For dust on the vehicle, you can use pump hairspray in the same method. Spray on the hairspraye then sprinkle on the dust.
Gino P. Quintiliani - Field Artillery - The KING of BATTLE!!!
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"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell