ok so, defenetly dont use ultracal or anny hard mold making material as you cant mold resin wich as detail in it in a hard mold making material as it will create a mold lock for sure and you wont be able to demold it without breaking everything.The best depending on the project(a little more info would help me to point you in the best direction.)i would sugest a rebound25 silicone mold backed with eather a ultracal,fiberglass or urethane hard shell wich is called a mother mold. dependind on what you whant to cast it could be a simple block mold also that is why more info would be needed
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