01-13-2010, 07:42 PM
Josh, there is a lot that you can do with washes and a paint brush or a stiff stipple brush with powdered chalks. Just remember that water runs down which means that rust streaks will tend to start around a rivet or scratch and then go down the side. Mud and dirt will tend to be kicked up by the wheels and then if it gets wet tend to streak down. Look at some pictures and copy what you see, and you'll be weathering in no time. Maybe start with a cheap Athearn Blue box or even a cheap toy freight car for practice if you don't want to risk messing up a really nice car.