Applying mud to you race car is very easy. Using a small container scoop some dirt from your yard into the cup. Be sure to remove any rocks or grass, and pulverize it as much as possible. Add a 50-50 mix of white glue and water until you get the consistency you like and using a flat paint brush approximately ½ " wide " paint" the mud on your car where you want it and let it dry. If you want more mud in the same area, just brush more on on top of the first coat!