This is vinamold ( just that it's old, that's why it is discoloured ).
The white stuff I use to make the hard molds is Casting Resin, a two pot mix. This resin copies with no shrinkage or expansion.
I use casting resin to copy the rubber mould, remove the rubber, then cut this mold away to a part line, replace the rubber mold ( stick in place with a little super glue ), coat in a small film of wax, then recast the other half (to make the mold a split unit so I can make more copies ).
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