I recently learned of an excellent way of coloring models to create convincing weathering and fading effects. Called oil dot weathering, the basic principle is to apply dots of oil paint to a base coat. Then with a thinner (one that does not react with base coat), dilute the pigments in the oil paint down. Once completed, a light film of the oil paint pigment remains to add color variation and streaking.
After covering the entire surface, I let it dry overnight to get the following results. This is a very easy way to add character and depth to any model.
