Use this plaster additive to make a great plaster casting in ComposiMold or ImPRESSive Putty Molds. To use, add 4% Plaster Powder Additive to your Plaster of Paris or other plaster material. The addition of the Plaster Powder Additive cures the plaster faster on the outside to make a strong solid casting. By creating a faster cure, the water in the plaster does not react with the ComposiMold or ImPRESSive Putty so the final product is a strong, hard plaster casting.
You can also use our pre-made ComposiMold plaster that has already been mixed.
3 oz. of ComposiMold Plaster Powder Additive is enough for 5 pounds of plaster powder. Mix the powder into the dry plaster mixture. Then mix the Plaster with cold water. Use 3 parts of Plaster with one part of water (by weight or volume). Let cure for 1 hour in the ComposiMold Plaster Molds before removing from the mold. Let the Plaster Casting cure for 24 to 48 hours before painting or sanding. Also, use a mold release such as vegetable oil or mineral oil.
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