I had reasonably good luck with this method. Spray the figures with medium-gray primer, then spray them from about 45 degrees above with flat white. Paint details (faces, hands, belts, headgear, rifles, etc.), then apply a thin wash of dark brown. After it dries, apply more wash until you get the effect you want. If you use acrylic dark brown thinned with water, you can put just a little detergent in the wash. It will destroy the surface tension and make the wash go into the cracks and depressions more smoothly. ...