Greetings all. I am working on layout with rock formations carved out of pink extruded foam, and I am interested in how some of you may have applied paint to this. I'm still a little confused on the washes process. My plan was to prime it with water based gray primer a couple of times, and then apply some flat black into the crevasses to create the dark shadow effect. The next step is what makes me unsure. I've read about washes without any specific detail on what type of paints to use, how to mix them down, or the best way to apply them to foam. I have purchased some acrylics in a variety of colors as well. The only thing I'm really sure about is that the colors need to be applied in order of darkest to lightest. The formations themselves should model dark granite. Anyone here had success with painting this stuff?