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How to make plaster of Paris

Updated February 21, 2017

Plaster of Paris is a quick drying form of plaster that is a excellent for creating masques and other craft shapes. The finished product is light and strong enough to worn out for an evening of Halloween fun, and yet soft enough to be carved to make the face and hands of a doll. You can make plaster of Paris with two simple ingredients that you most likely already have in your kitchen.

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  1. In a mixing bowl combine 240 ml (1 cup) of warm water for every 480 ml (2 cups) of flour.

  2. Mix the flour and water until there are no lumps remaining. The finished paste should be smooth and creamy.

  3. Bring your plaster of Paris to where you will be working immediately so it will not cool down.

  4. Tip

    Prepare the surface of your cast before you begin mixing the plaster of Paris, this way you can use it as soon as the mixture is smooth enough.

    Warning

    Don't try to use plaster of Paris that has cooled in the mixing bowl, nor try to save it for later use, once the plaster of Paris has cooled it will no longer be malleable enough to use for anything but will form a cast of the bottom of your bowl.

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Things You'll Need

  • Mixing bowl
  • Flour
  • Warm water
  • Measuring cup
  • Mixing spoon

About the Author

Cassandra Tribe has worked in the construction field for over 17 years and has experience in a variety of mechanical, scientific, automotive and mathematical forms. She has been writing and editing for over 10 years. Her areas of interest include culture and society, automotive, computers, business, the Internet, science and structural engineering and implementation.

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