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How to Make Bricks Using Plaster of Paris

Updated April 17, 2017

Plaster of Paris is a white powder made from gypsum that, when mixed with water, becomes a thick paste. The paste dries relatively quickly and is used in craft projects. It easily forms moulds or sculptures that become durable as the plaster hardens. The finished project is usually then painted. Making bricks from Plaster of Paris is a relatively simple process.

Calculate the quantity and dimensions of the bricks you would like to make. Knowing the exact dimensions will help you determine how much Plaster of Paris to mix up.

Measure out equal amounts of plaster and water using measuring cups. Allow the mixture to soak for several minutes before stirring with a spatula. The quantity of plaster mixture will ultimately depend on how many bricks you are making.

Form the shape of the brick with your hands. You will want to spend no more than 10 minutes on each brick because Plaster of Paris begins to dry out as soon as it comes in contact with air. Use a measuring tape to ensure the brick is the appropriate size.

Smooth the edges of the brick with a nonserrated knife. Place finished bricks on a sheet of waxed paper, and allow to dry completely, which may take 45 minutes to one hour, depending on the thickness of the bricks.

Leave the bricks on the waxed paper for 24 hours if you are planning on painting them.

Warning

Allow any leftover plaster to harden in the disposable bowl, and then throw it away. Never pour plaster down the drain, as it will damage your pipes.

Things You'll Need

  • Measuring cups
  • Disposable mixing bowl
  • Spatula
  • Measuring tape
  • Nonserrated knife
  • Waxed paper
  • Paint (optional)
  • Paintbrush (optional)
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About the Author

Natalie Chardonnet began writing in 2006, specializing in art, history, museums and travel. In 2010, she presented a paper on those subjects at the National Conference of Undergraduate Research. Chardonnet has a Bachelor of Arts in art history and a minor in Italian studies from Truman State University, in addition to a certificate in French from Ifalpes University in Chambery, France.