How to Make Two-Part Silicone & Rubber Candle Molds

Written by katebo
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How to Make Two-Part Silicone & Rubber Candle Molds
Make your own candle moulds. (candle image by Eldin Muratovic from

You can make a homemade candle mould out of rubber and/or silicone, allowing you to make as many candles as you wish. A two-part mould is advisable for candlemaking because candles can't be removed as easily from a one-part mould. You can use this two-part mould as many times as necessary to cast wax.

Skill level:

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Things you need

  • Candle
  • 5 rectangular scrap acrylic pieces
  • Glue gun with glue
  • Non-hardening clay
  • Pencil
  • Uncooked rice
  • Liquid measuring cup
  • Urethane RTV moulding rubber
  • Mold-release spray
  • Butter knife
  • Silicone RTV

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  1. 1

    Make a container mould out of straight-edged scrap acrylic. Set a candle on its side on top of a table. Arrange four pieces of acrylic into a rectangular shape around your candle. Slip a bottom piece underneath the candle. Position the acrylic so that there is approximately 1/4-inch of space around the candle.

  2. 2

    Glue the acrylic together using glue from a glue gun and allow it to dry. Make sure to put enough glue on the edges of the acrylic pieces to make the mould waterproof.

  3. 3

    Spread non-hardening type clay onto the bottom of the mould container just deep enough to cover the candle up to its midline when it will be later embedded in the clay. Make sure there are no holes or bubbles in the clay.

  4. 4

    Press the candle down into the clay, taking care not to push it all the way down to the bottom of the mould container.

  5. 5

    Press about six to eight, 1/2-inch holes into the clay around the candle with the eraser end of a pencil.

  6. 6

    Pour uncooked rice into the mould container until it covers the candle completely plus an extra inch. Then pour the rice out of the mould container and into a measuring cup. Take note of the ounces and mix this amount of urethane RTV moulding rubber according to the manufacturer's directions.

  7. 7

    Spray the inside of the container along with the candle and clay with a mould-release spray.

  8. 8

    Pour the urethane slowly into the mould container near the corner of the container. Allow it to set for at least 24 hours.

  9. 9

    Remove the base of the container, prying it loose with a knife.

  10. 10

    Flip the mould container over and remove the clay with the knife.

  11. 11

    Spray the inside of the container with mould-release spray once again.

  12. 12

    Mix the same amount of silicone RTV as urethane from Step 6. Pour it slowly into the corner of the container and allow it to set for at least 24 hours.

  13. 13

    Pry off the sides of the container with a knife and carefully separate the two pieces of the mould.

Tips and warnings

  • Sandwich the mould between two pieces of thin wood and hold it all together with some rubber bands. It's now ready to pour wax into the mould to create your candles.
  • Don't pour urethane or silicone directly onto the candle because this could cause bubbles in the urethane or silicone, thus ruining the mould.

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