How to make molds for forming concrete

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How to make molds for forming concrete
Making concrete moulds is simple. (concrete image by grafiker from Fotolia.com)

Creating a mould for making concrete casts is an easy way to save money on projects requiring bricks, paving stones and other concrete objects. Mold-making is a simple project that requires only a few basic supplies and the patience to work slowly. Once the mould is created, you can use it repeatedly to create high-quality casts of concrete objects. The process of making a mould for forming concrete you can finish in an afternoon.

Skill level:
Easy

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Things you need

  • Concrete object
  • Silicone
  • Paintbrush
  • Gauze

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Instructions

  1. 1

    Ensure the concrete object you will use to make the mould has no flaws or chips on its surface. These will affect the shape and appearance of the mould and the resulting casts.

  2. 2

    Use a paintbrush and silicone to paint the top and sides of the object. Leave the bottom open so you can later remove the object from the mould and use it for making casts.

  3. 3

    Paint each layer individually and allow it to dry for 10 to 20 minutes, or according to the directions on the silicone. This will prevent the silicone from becoming lumpy or runny.

  4. 4

    Paint six to eight layers onto the object. The silicone should be forming a thicker layer after each coat.

  5. 5

    Add strips of gauze to the wet surface of the silicone and allow them to dry into the mould. This will help the mould keep its shape when concrete is poured in. Once the gauze is dry, add three to four more coats and allow them to dry.

Tips and warnings

  • Add concrete dye to concrete mix to create a coloured brick or cast.
  • Place the mould in a bucket of sand and surround it with sand up to its lip to help it maintain its shape while the cast is drying.
  • Make multiple moulds of the same object to make the casting process go faster.

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