I used 5-6 molds to re-create the Maryland Heights cliff above Harpers Ferry WVA on my old layout. I had lots of pictures of actual site to reference and I think it came out pretty good. I started with a base mountain of chunks of leftover packaging styrofoam that I stuck together with Greatstuff foam insulation. Next I draped the surface with paper towels dipped in plaster. Next I plastered on the rock molds and filled in gaps using the Battista method (check out his first Black Diamond Railway video). The plaster rock also takes coloring very well and I was able to match the rock color with the backdrops I printed from my photos. I also used masonite to create a thin relief rock wall made up of broken ceiling tiles, rock molds, and glued on greenery. Was well worth the effort.
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