How to Cast With Clay

Written by kelly sundstrom
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How to Cast With Clay
Make a casting mould using polymer clay. (Hemera Technologies/ Images)

Before you can make a casting of an object, you must create a mould of the object. Plaster of Paris is a common material used to create a mould, but is messy and can be dangerous to work with. Instead of using plaster of Paris, make a casting mould using polymer clay, which can be baked right in a standard oven and does not cause a mess. This enables you to create a mould efficiently.

Skill level:
Moderately Easy

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Things you need

  • Polymer clay
  • Clay wire
  • Baking tray
  • Oven

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  1. 1

    Knead 0.907kg. of polymer clay for 5 minutes to soften the clay to remove any trapped air bubbles. Choose any colour of clay that you prefer.

  2. 2

    Form the polymer clay into a ball using your hands.

  3. 3

    Hold the handles of a clay wire in between your hands, and stretch the wire taut. Push the taut wire straight down onto the clay ball to split the ball in half.

  4. 4

    Place an object that you want to cast in between the two clay halves, and press the halves together. Gently peel back the two halves, and remove the object to leave the impression behind.

  5. 5

    Place the two clay halves onto a baking tray with the impression sides facing up. Bake the halves in a 200 degree Fahrenheit oven for 15 minutes, then allow the halves to cool on the baking tray for 30 minutes.

  6. 6

    Press more polymer clay in between the two bakes clay halves, and press the halves together firmly. Pull the halves apart again to reveal the cast clay.

  7. 7

    Bake the cast clay object on a baking tray in a 200 degree Fahrenheit oven for 15 minutes.

Tips and warnings

  • Do not touch hot polymer clay, which can cause burns on skin.
  • Keep hot polymer clay out of the reach of children.

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