Recently I had some difficulty in pouring a one sided two-piece soapstone mould that I had carved because I had forgotten some of the “best practices” rules I have been slowly working out over the last few years. These best practices I shall consolidate into a post later, however for now lets just consider the solution to fixing this particular mould without having to entirely re-carve it.
As the mould was not generating enough pressure from the weight of molten pewter in the button I needed to find a solution that would allow more height in the button whilst not adding significantly to the cooling effect of the Soapstone. I achieved this by laying the carved mould flat and creating two extra pieces out of wood to pour through. The advantage of this was that the wood is quite a good insulator and allowed the heat of the molten pewter to remain until it spread evenly on the surface of the soapstone below. As the mould was flat this also allowed for a more even pressure spread across the face of the token.
I am tempted to create a generic RTV Silicon version of this method as the wood does tend to char and disintegrate over a number of castings.

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