DIY Polyurethane Open Molding

Written by shae hazelton
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An open-sided polyurethane mould is an ideal tool when it comes to making a detailed mould with one flat side. Making a polyurethane open-sided mould is a simple process that anyone can complete with a little patience, but it may take a couple of tries to create the best mould. If you are new to the mould-making process, it is best to start with a one sided mould before you move onto the more complicated two-sided version. Once you create the mould, it will last for a long time if you store it properly.

Skill level:
Moderately Easy

Things you need

  • Mold container
  • Craft clay
  • Non-stick spray
  • Polyurethane

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  1. 1

    Fill a moulding container half way full with grey craft clay. Place your moulding shape on top of the clay with the side you want to mould facing upward. Press the end you won't mould into the clay slightly.

  2. 2

    Spray the inside of the moulding container with a non-stick spray release to keep the polyurethane from bonding to the clay. Pour the liquid polyurethane into the mould container until it covers the entire moulding object.

  3. 3

    Read the label on the polyurethane container to determine how long the polyurethane needs to dry. Flip the mould box over once the polyurethane dries. Release the bottom panel of the moulding container.

  4. 4

    Dig out the clay gently. Don't scratch the polyurethane as you work. Pull the mould shape from the polyurethane as well.

  5. 5

    Turn the mould container on its side and tap on the polyurethane cast until it falls out.

Tips and warnings

  • You can find a mould container at your local craft store that provides sculpting supplies.

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