The following is an easy method for creating a flexible negative mold for use in making plaster or polyester resin castings.
Knox* Unflavored GelatinEthylene Glycol (permanent antifreeze)Water
Hot PlateDouble BoilerPlastic or Non-porous Container (for mold making)Coffee Can with Lid (for storage)Positive of Desired Casting. The best results are achieved with non-porous objects such as metals, stone, glazed ceramic, glass, plastics, and Plasticine®.
In the top of a double boiler add equal parts by weight: dry gelatin mix, cold water, and ethylene glycol. Stir the mixture into a smooth slurry and begin to heat. Keep mixing over the heat until the gelatin is all dissolved and you have a semi-transparent ...