I have glued window screen to an old backdrop and then molded it after it dried. The downside is you'll need to use Flex-glue (not the stuff the guy sell in the infomercial or some sort of flexible white glue (Rose Brand sells it for $60/gal, there are other companies out there that sell it as well – I used to get it from swift adhesives in a 5-gallon pail for around $20/gal). It's a very successful method if you need to mold large scenic pieces with minimal framing (make sure you get a huge plastic drop cloth under it before gluing the screen to the drop). In fact, I used that method to create an Ice wall for Terra Nova, which included a cave.
Whatever you decide, experiment with a few methods first before you put in the expense
Good Luck with your project…
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