Getting ready to take my first shot at building a tunnel/mountain. I've started rough carving the basic structure out of pink foam and need to start picking up supplies to finish. I plan to fill it out with cardboard strips, cover that with plaster cloth and then texture it with Structolite. Only problem is I can't find Structolite anywhere in Seattle. The local Home Despot has USG "UltraLightweight All Purpose" and "Lightweight All Purpose" joint compound. Are these similar and good substitutes for Structolite?
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