The plaster batter can be brush painted onto the cloth. The different coating can be Sculptamold, as already suggested, or simply a thin mix of plaster of paris (mixed to a pancake batter consistancy or a little thinner). Sometimes, you can fill the holes as you apply the plaster cloth simply by using an old paint brush to spread the plaster evenly on the cloth. You can either apply a second layer of plaster cloth or you can apply a different coating over the existing cloth. The problem for WS cloth for rockwork is that it really isn't flexible enough for the small details. Sculptamold works for me, but I've seen really terrific rockwork using other compounds. Perhaps he'll see this thread and answer your question with his techniques. I know that Art Hill makes absolutely SPECTACULAR mountains out of stacked foam, using-I believe-Gypsolite for the rock details. Other modelers might chime in here with their techniques, also. It gives a 'grainy' finish when dried-quite rock-like-and takes staining very well. The Sculptamold will stick to anything-foam or a hydrocal base, and has a working time of about 1-2 hours. I use WS plaster cloth to cover most of my scenery, usually overlapping layers, but for my rock-work, I generally go to a thin layer of Sculptamold, either using a casting, or applying it directly and working it. If you're building rock ledges out of foam, my suggestion would be that instead of using the WS plaster cloth to cover them, using either hydrocal or Sculptamold applied with a thin-bladed knife, working the countours in with the blade.
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