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This is a very fine plaster intended for casting.
Plaster moulds are normally only used once and are referred to as waste moulds. The addition of a little PVA will strengthen the mould. The original is generally modelled in clay.
2.5 kg bag
It must be treated with a release agent before use, and moulds must be sealed prior to using resin based systems- consider using G4 [see Barriers and Release Agents].