Trainman713 pretty much explains the materials. I mostly use 1/8" Masonite now, just layered up. I cut expansion joints with a straight edge and a razor saw or a utility knife dragged sideways. Cracks and spalls are done with a utility knife. I mostly paint with Krylon khaki now, since it goes faster and when doing the wash, there's less chance of pulling wet paint out of the cracks and making a repaint necessary. Hope this helps, thanks for the kind words..
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