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Hello! I'v used Plaster of Paris for scenery projects, ranging from hardshell scenery to rock molds. While not as dense as Hydrocal, it does set quickly, but also takes color well. I've generally been pleased with it. If you're looking for a product to fill holes in extruded foam board or to build up a contour, try Sculptamold. You can order it from Walthers at www.walthers.com or try your local hobby shop. It will run about $6 or so a bag, if I recall, but a little goes a long way. As for extruded foam board, check around at home construction sites. Most builders use the 2" variety for insulation. Make sure to ask the supervisor or the person in charge on the job site, and they might give you some for free. Paul Schmidt Contributing Editor Trains.com
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