A few years ago my mother used I think wall paper paste glue and cloth and used it to shape cloth with a mold to make christmas angles which she sold at a craft fair... She said it could also be used for model railroading and be shaped to use as moutain and also painted and it become rock hard..you can use any form to make shapes once it drys in place its hard.
When I have time I will ask her how its done and get some more detailed inteructions and I think I will use it as cover for some of my moutains on my ho scale railway.
Brock Bailey snipped-for-privacy@shaw.ca Victoria BC Canada