How to Pour Latex Into a Mold

Written by alex smith
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How to Pour Latex Into a Mold
Liquid latex can be used to make Halloween masks. (Jupiterimages/Photos.com/Getty Images)

Liquid latex is used to make masks, small figures and other objects. The product is cast into a mould which has been made on a sculpted form, creating a latex copy of the original sculpture. Ideally the mould will be made of a porous material such as plaster, which can absorb the ammonia out of the latex as it dries. If the mould is made of a non-porous material such as metal or fibreglass, the process must be modified.

Skill level:
Moderately Easy

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Things you need

  • Paint brush
  • Straps, clamps or bolts (optional)
  • Books or other objects with which to prop the mould up
  • Cling film

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Instructions

    Porous Molds

  1. 1

    Brush a layer of latex into the mould with a paint brush. This will ensure that all fine detail is captured.

  2. 2

    Strap, clamp or bolt the sections of a multi-piece mould together while the latex is still wet. Doing this before the latex dries will help prevent leaks. Apply hot glue or duct tape onto the seams to further prevent leaks. If your mould is a single piece (such as for a simple face mask), skip this step.

  3. 3

    Allow the brushed-on latex to dry. This should only take a few minutes.

  4. 4

    Prop the mould up against several objects such as books or sandbags. The mould must stand upright, with the pour spout facing up, while it is full of latex.

  5. 5

    Pour liquid latex into the mould until it is full.

  6. 6

    Tap the sides of the mould with your fingers or a rubber mallet to dislodge any trapped air bubbles, which will rise to the surface.

  7. 7

    Cover the mould opening with cling film to prevent a skin of dried latex from forming on the latex surface.

  8. 8

    Leave the latex in the mould for one to two hours. During this time the ammonia, which keeps the latex liquid, is absorbed into the mould, forming a skin against the mould walls.

  9. 9

    Pour the remaining latex back into the container.

  10. 10

    Allow the latex remaining in the mould to dry.

  11. 11

    Remove the dried latex cast from the mould. It will pull out with little resistance.

    Non-Porous Molds

  1. 1

    Brush a layer of latex into the mould with a paint brush. Store the brush in the latex container, covered with cling film, as the layer dries.

  2. 2

    Brush a second layer of latex into the mould once the first layer has dried. Allow this layer to dry as well.

  3. 3

    Brush 10-20 additional thin layers of latex into the mould until you have built up the desired thickness. Each individual layer must be thin to keep a skin from forming, which will prevent the latex underneath from drying.

Tips and warnings

  • Do not allow latex to get into hair, clothing or carpeting. It will be very difficult, if not impossible, to remove it.

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