How to Reconstitute Plaster of Paris

Updated February 21, 2017

Plaster of Paris can be used to create a wide variety of arts and crafts projects such as sculptures, castings and moulds. Often, plaster of Paris is costly and is usually only used once. Fortunately, there is a way to reconstitute used plaster of Paris, enabling you to reuse it again and again. To reconstitute plaster of Paris effectively, it is important to follow a few necessary guidelines that will ensure that the plaster will reconstitute properly.

Put on a dust mask, rubber gloves and protective goggles to protect your lungs, skin and eyes from the plaster of Paris dust.

Place a large bowl underneath your plaster sculpture.

Hold your plaster of Paris sculpture in one hand, and use the other hand to rub rough-grain sandpaper over the sculpture. Use small, circular motions with the sandpaper.

Move the sandpaper around the plaster so that the grains effectively grind down the plaster into usable plaster of Paris powder.

Once you have about 3 cups of plaster of Paris powder in your bowl, add 1 cup of water into it.

Stir the mixture well with a spoon, and use it for your arts and crafts projects.

Things You'll Need

  • Plaster of Paris sculpture
  • Dust mask
  • Protective goggles
  • Rubber gloves
  • Rough-grain sandpaper
  • Bowl
  • Spoon
  • Water
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