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It's not that hard to have all the clay-like flexibility of PMC and
the look and price of a cast piece. I make models out of
Primo-Sculpy and a silicone mold of these models with Sorta-Clear 18,
a Smooth-On product sold by Reynolds. I pour wax into the molds and
cast these wax patterns conventionally. If you attach two
Primo-Sculpy "wires" to your model--one as a pouring channel and
sprue and one as an air vent, you won't even need to use a wax
injector. Just pour molten wax into the mold.
Someday I will perform last rites over my wallet and try Pricey
Metal Clay. I will see if it is easier to use than Primo-Sculpy and
a silicone mold.