Maybe try dipping the plaster mold in very hot wax (to get a thin coating) for sealant, or spray with mold release compound like people use for putting fiberglass over a concrete mold?
I want to learn to flintknap, too. In Leadville, where I partly grew up, there were arrowheads all over the place, and still are many flintknapping sites where there are deep piles of tiny flint shards, mostly on top of ridges where they sat, watching the valley below for game.
That's one very small park, if I'm recalling it correctly, for any sense of privacy whatsoever.
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I want to learn to flintknap, too. In Leadville, where I partly grew up, there were arrowheads all over the place, and still are many flintknapping sites where there are deep piles of tiny flint shards, mostly on top of ridges where they sat, watching the valley below for game.
That's one very small park, if I'm recalling it correctly, for any sense of privacy whatsoever.