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I used the spray foam used for housing insulation (the small expansion one).  My mountain kept growing for over 2 years...  If this stuff is anything like the house insulation stuff, you'll be patching cracks and holes for a while.  Just my 2c. However, the plus side was it was extremely easy to use.  just mold out the tunnel and use some crumpled paper for a general form and spray the foam all over.  Once its "dry" then you can cut it to your desired shape and glue on rock molds. I realize this isn't "mountains in minutes" but its another alternative.
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