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Since you said "Ideas" I am assuming you're talking about prototypes of your ideas . It's better to go the cheapest route at first when creating a mold just in case the finished product does not perform as expected and modifications are required . You can create a two- part mold capable of pouring molten lead into a few times before degrading out of plaster product called "Durhams water putty " You need to bake the mold after it dries to insure no moisture remains before pouring hot lead into it . It is really the cheapest option .