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I'm afraid plastic sheeting would prevent the plaster-soaked towels from getting a grip on the wire...you might put some plastic "UNDER the layout to prevent plaster dripping on the floor. There's a product called Sculptamold that I like for smoothing over the top of hardshell scenery. You can find it in most hobby stores, & I believe it's available through Walthers. (www.walthers.com) Sculptamold is a more flexible, lighter weight material than plaster... It also has a much slower working time, unlike most plaster. I still prefer plaster for rock castings, but I really like Sculptamold for a ground cover base, & it works fine in conjunction with the plaster. Go ahead & lay your plaster-soaked towels on the wire mesh...maybe a couple of layers. But try the Sculptamold...you can use it to do any patching, or smoothing out any irregularities you find in your hardshell base. Good Luck!
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