Step 4: Sculpting Your Masterpiece

Once the spray foam has completely hardened, you can begin carving. As I mentioned in the previous step, be patient. The foam will expand a lot as it dries so you'll have plenty of area to carve on.

I used a fine-toothed pull saw to carve the faces of the rock. It worked well because it was long enough to cut wide faces. Work your way across the entire mountain cutting off the rounded "lava-like" sections of spray foam. Be careful not to cut too deep -- you don't want the chicken wire to show through.

I cut horizontal and vertical ridges into the rock face to simulate a real mountain.
Are you sure that the recommendation for thinned acrylic paint was for foam mountains? Or was it for foam mountains covered with a layer of plaster. For example, using plaster gauze used for casts as in a broken bone? Or plaster coated paper? Or a coating of plaster spread with a putty knife? Or even plaster cast in a rock mold?
Awesome Instructable! These techniques are simple,effective and usable on many unrelateds. My only "criticism" (way to strong a word, as I really think it came out EXCELLENT) is there is no portal. Typically a tunnel has a concrete or stone block structure at the entrance and exit.
Thanks for the tip -- I suppose I could carve a portal out of wood or perhaps form it with Super Sculpy.
amazing job love the whole track did you know you could add a bit of realism to train by weathering
Thanks for the recommendation!

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Bio: Mad scientist, woodworker, creative evil, artist, tinkerer, father of five creative hooligans.
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