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You put plaster cloth on wadded up newspaper, foam, bubblewrap, or whatever, just to hold it up until it sets. It's same basic stuff casts doctors use for broken arms. Can also use brown paper towel dipped in wet plaster of paris (the old fashion way). I have also had good results using expanding spray foam insulation in a can for light weight mountaints. Spray on wire and tape form and smooth and conture with trash bags. Allow foam to dry and remove trash bags, they peel right off. Low expansion foam works best for this. Then paint with latex. Trees just poke in. Can add stuff over it too, like plaster rock casts and spackling.
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