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  • Plaster of Paris Casting

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Plaster Powder Additive 3 oz. (Enough for 5 pounds of Plaster of Paris)


Product Description

For ComposiMold or ImPRESSive Putty Molds with Plaster of Paris. To use, add 4% Plaster Powder Additive to your Plaster of Paris. The addition of the Plaster Powder Additive is to curethe plaster  to a strong solid casting in these molds. By creating cure more quickly, the water in the plaster does not react with the ComposiMold or ImPRESSive Putty to give strong, hard plaster castings.

Plaster of Paris comes as an easy-to-mix formula that mixes with water and dries to a dense, durable, and smooth and bubble free finish. Plaster of Paris is a great material to use for basic castings and molds and art projects because it is simple to mix and use. The Plaster of Paris sets in a few minutes, although it takes an hour before it is ready to be removed from the mold. It takes 24-48 hours to fully cure. 

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.


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Plaster Casting of a Duck Decoy 01:26

How to Make a Plaster Casting of a Duck Decoy with ComposiMold. www.plaster-casting.com First make the moldbox using a box of some sort. The easiest is to use a cardboard box with a trash bag liner. Spray the outside with an adhesive and press on a trash bag for a liner. Hot glue in the duck so it won’t float. You’re now ready to make your mold. We’re using used ComposiMold that we melted in a double boiler. Pour in the ComposiMold. Fill up and around the duck. Let the mold cool to solidify. We left this overnight. Pull off the mold box and pull out the original duck. You are ready to make your casting. We will be using ComposiMold’s new Plaster specifically designed for ComposiMold and Impressive Putty Molds.This duck uses 5 pounds of ComposiMold Plaster. Mix the plaster 3 parts plaster to 1 part water and pour into the duck mold. Let solidify for 1 hour, Remove the Duck Reuse the mold for more ducks or re-melt for new shapes Let’s make it. Thank you. No ducks were harmed in the making of this video. The duck bill broke and we glued it back on. www.ComposiMold.com

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