No issue at all, let the P of P cure up until it seems to be almost setting, then plop it on the spot you want the rockwork to be and hold it in place really making sure it is mushing into the surface until it sets up...the rubber mold will peal off the cured P of P no problem. Doing rockwork using molds is pretty easy and very gratifying once you get the hang of it. It's cheap too!
Bob
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