You'll get a laugh out of this process. Now remember, I was 20 years younger back then. The truck is painted primer grey like a lot of mud hole trucks were back then. My brother took his Honda four wheeler and spun up some loose dirt that was very fine almost like powder. I taped out the windshield wiper pattern and then sprayed the truck with clear lacquer. While the lacquer was still wet we threw the dirt on it, and then sprayed it with clear lacquer. This took several times. After it dried, I air brushed it with Testors flat brown. When that dried, I dull coated it. The few places where the dirt fell off, left grey primer, which would look like a truck coming from the mud hole with mud falling off. I was pretty happy with the finished product. I'm going to try this again one day in the future.