How to make a concrete mould

Written by lacy enderson
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How to make a concrete mould
Any shape can be replicated. (

Making a mould for concrete is simple. There are numerous products on the market that can be applied to an object to create a mould. Rubber substances are favoured because they are flexible and easy to make. Concrete is poured into a pre-made mould, and whatever object you are trying to recreate will appear when the concrete dries. Some moulds can be made using one side of the object but some require making a mould of both sides. Either way, read through the following steps to learn how to create a mould so you can turn your favourite item into concrete.

Skill level:

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Things you need

  • Gutta percha sheet
  • Naphtha
  • Bowl
  • Soapy water
  • Plaster

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  1. 1

    Cut a piece of 6 mm (1/4 inch) gutta percha to size. This product is rubber like, flexible and easy to manoeuvre.

  2. 2

    Soak the gutta percha in NAphtha until it swells. This product is a flammable liquid mixture of hydrocardons. Remove the sheet from the mixture and soak it in hot water.

  3. 3

    Apply the wet and mushy gutta percha onto the surface of an object you would like to replicate. For the sake of this article, let's use a vase. Press the rag like material onto the surface of the vase firm, yet slowly.

  4. 4

    Press the rubber hard into all the cavities. The rubber must be formed around the vase entirely so it resembles the vase exactly when you are finished.

  5. 5

    Pour a mixed plaster over the top of your rubber mould. The plaster will dry quickly, helping your rubber mould keep its shape until it dries.

  6. 6

    Remove the plaster from the rubber, then remove the rubber from the vase. The rubber mould can now be used to make a concrete vase.

Tips and warnings

  • When creating a mould, such as a vase, with two sides, make a rubber mould of both sides.
  • Wear a mask and gloves when working around chemicals.

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