How to Make a Positive Mold

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Most molds used in ceramics are negative molds in which you pour ceramic clay into a mold to produce clay objects. However, some projects require the use of a positive mold, also known as a slump or hump mold. You can make positive molds out of bowls or anything that will hold plaster. Once you've made the positive mold, you can build a sculpture or ceramic bowl directly on top of the mold. You then allow the item to dry until it is leather hard, then you remove it before it begins to shrink.

Things You'll Need

  • Plastic bowl
  • Clay
  • Clay tools
  • Plaster
  • Water
  • Large bucket
  • Long, plastic cooking spoon
  • Halloween mask
  • Cloth-backed adhesive tape

Positive Bowl Mold

  • Mix the plaster according to the manufacturer’s instructions in a large bucket.

  • Stir the plaster with a cooking spoon until you thoroughly mix it.

  • Pour the plaster into a plastic bowl.

  • Allow it to dry for 24 hours before using.

Positive Sculpted Mold

  • Create the hollow base shape that you want to use out of clay. You will be making a mold of the inside of the clay shape.

  • Mix the plaster according to the manufacturer’s instructions in a large bucket until smooth.

  • Pour plaster into the clay shape and allow it to set up. Once it is dry, peel off the clay and let it dry for 24 hours before using.

Positive Face Mold

  • Buy a Halloween face mask.

  • Tape the eyes and any openings with a cloth-backed adhesive tape on the outside of the mask.

  • Mix the plaster according to the manufacturer’s instructions in a large bucket until smooth.

  • Pour the plaster into the mask and allow it to set up.

  • Remove it from the mask and let it dry for 24 hours before using.

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References

  • Photo Credit ceramic fish on slate image by Doug Stacey from Fotolia.com
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