How to make silicone soap molds

Written by tricia ballad
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If you make moulded soaps, you probably have some favourite moulds--and have ideas for shapes you would like to make but cannot find moulds for. Silicone is a great moulding material for soap. It is flexible and non-stick, so the finished soap pops right out of the mould. It also is heat resistant, so the melted soap will not damage the mould. The hardness of your soap will affect the designs for your mould. For example, French milled soaps can hold more complex shapes than cold processed glycerine soaps can.

Skill level:
Moderate

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Things you need

  • Primary model
  • Small, firm paintbrush
  • Two-part silicone modelling compound

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Instructions

  1. 1

    Choose a primary model. This can be any shape you want to duplicate in soap. Objects with hard surfaces, such as seashells or coins, work best.

  2. 2

    Clean the model. Use a paintbrush to thoroughly clean the surface, removing any dust or dirt that has accumulated, especially in the indentations of the object.

  3. 3

    Mix a two-part modelling compound, such as Silicone Plastique. Knead the two parts together until the entire mass is uniform in colour. Once mixed, the compound will begin to cure in 10 to 15 minutes, depending on the temperature. Therefore, you will need to work quickly.

  4. 4

    Apply a thin layer of modelling material to the primary model. Work it into the details of the object, completely filling in all indentations.

  5. 5

    Apply a second layer of modelling material over the first. This layer should be at least 1/4-inch thick and smooth on the outside. Be sure to apply the second layer before the first begins to cure or the two layers will not adhere.

  6. 6

    Cure the mould for at least an hour at room temperature.

  7. 7

    When the modelling material is completely dry to the touch, remove the primary object. Your silicone soap mould is ready to use.

Tips and warnings

  • Refrigerate the two parts of the modelling compound before mixing to increase your work time. This will slow down the curing process.
  • Silicone Plastique is food-grade silicone, so you also can use your moulds for chocolate, gum paste and other pastry-moulding crafts. Be sure to clean them thoroughly between uses.
  • Silicone moulds are dishwasher safe.
  • Work quickly once you have mixed the two parts of the silicone modelling compound. Once the material begins to cure, it cannot be moulded.

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