Thanks. First off, Sand the exterior of the foam board. Different grits for different textures. I also use a large lumpy rock to tap the foam to create some unevenness. Once sanded it will absorb the paint, this allows you to use a watery paint. Without sanding it the paint will lay on the surface uneven and need many many coats for a light color. I base paint the foam with an interior acrylic paint first, not heavy coat. The cans found at Lowes. I always use off white or dark grey. All the rest of the colors are Apple Barrel or the cheap Folk Art paints. I mix all my colors from primaries, black, white, and silver. Stone and concrete is easy to paint with watery paints that absorbs. You just put a wet light color on first, than dab the other color tones on and it will blend on its own quite nicely at spots and not at all in other spots. Don't do total coverage with the other colors. All watery paint. Takes forever to dry (I put mine in the sun) but the result is worth the patience. Hope this helps bro.
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