How to Make Homemade Plaster of Paris for Moulds

Written by erin maurer
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How to Make Homemade Plaster of Paris for Moulds
Use acrylic craft paints to decorate dried Plaster of Paris shapes. (kids paint craft image by Christopher Hill from <a href=''></a>)

Plaster of Paris is a liquid-like building material similar to cement, but unlike cement, it remains relatively soft after setting, making it ideal for interior finishing work or craft projects. It is not recommended for any weight-bearing use. Plaster of Paris works well in craft moulds and can be moulded into virtually any shape. After the plaster dries, it can be painted with acrylic craft paints for decoration.

Skill level:
Moderately Easy

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Things you need

  • Newspaper
  • Masking tape
  • Plaster moulds
  • 3 c. all-purpose flour
  • Large mixing bowl
  • Wooden spatula
  • 2 c. warm water
  • Paper towels
  • Craft knife
  • Baking tray
  • Acrylic paint
  • Paintbrush

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  1. 1

    Spread newspaper over a table to protect it from plaster which tends to be a messy material. Secure newspaper coverings to the table with masking tape. Set the craft moulds out on the table.

  2. 2

    Pour three cups of all-purpose flour into a large mixing bowl. Stir with a wooden spoon to help add air to the flour.

  3. 3

    Add two cups of warm water to the mixture. Stir until all of the lumps are smooth. Use the spoon to transfer the plaster directly into the craft moulds. Tap the edges of the moulds to avoid trapping air bubbles in the plaster.

  4. 4

    Allow the plaster to set in the moulds for about 30 minutes. Wipe the bowl and spoon out with damp paper towels.

  5. 5

    Touch the plaster to see if it is firm. Slide a knife around the edges of the mould and carefully pop out the plaster shapes. Transfer them to a baking tray. Allow the shapes to dry overnight.

  6. 6

    Paint dried plaster shapes with acrylic craft paints.

Tips and warnings

  • Plastic candy moulds come in many shapes and work well for this project. Ice cube trays in various shapes are also recommended.
  • It is important to wipe the bowl and spoon clean quickly. Plaster of Paris sets quickly and can clog up sink drains.

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