Do-It-Yourself Plastic Molds

Written by carl o'donnell
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Do-It-Yourself Plastic Molds
Plastic moulds can make coffee cups, bowls, vases and more! (Jupiterimages/Creatas/Getty Images)

The only limit on what a bland sheet of plastic can become is your imagination. If you are interested in making a plastic mould, you're already halfway finished. All that you'll need to make your own mould is a sheet of mouldable plastic, a handmade plastic cast and a clear vision of what you'd like your mould to look like. In under an hour you can have a mould for a cup, bowl, Jell-O mould or any other object.

Skill level:
Moderately Easy

Things you need

  • 1 sheet mouldable plastic
  • Plastic cast
  • Razor

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  1. 1

    Find a plastic cast that suits your needs. If you'd like to make a plastic cup, find a cup that is slightly smaller than the plastic cup you'd like to mould. The same principle applies to bowls, plates, vases and other items. Consider purchasing a lump of clay if you would like to make a customised cast. Simply knead the clay into your desired shape, let it dry and bend your mouldable plastic around it.

  2. 2

    Take your sheet of mouldable plastic and place it in a hot bathtub. If your sheet of plastic is small, consider a pot of boiling water instead, as the plastic will heat faster. Prod the plastic with a stirring device. Be careful not to touch your hand to the hot water. When the plastic can be easily deformed by the stirring device, it is ready to be moulded around your cast.

  3. 3

    Use tongs to pull the plastic out of the water. Using tongs or oven gloves, lay the plastic around the object to be cast.

  4. 4

    Watch the plastic carefully. As soon as it seems as though it is no longer easily malleable, remove it from the cast. You do not want it to dry fully on the cast. If it dries fully, the plastic will adhere to the cast. After removing the plastic, it should be able to hold its own shape, but should remain fairly soft. This is a good time to cut off any excess plastic. Sometimes the corners of the plastic sheet overshoot the mould. Cut these off with a razor blade. Be careful to push the blade away from you when you cut, not toward you.

  5. 5

    Let the mould sit until dry. This takes just over an hour. Waiting until it is only lukewarm to the touch is a good way to ensure that it has fully solidified.

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