How to Cast Hollow Parts in a Mold Using Wax, Clay, Epoxy and Cement

About: Make your flexible rubber molds with ComposiMold. Make more unique molds with 1 pound of ComposiMold than with 20 pounds of other mold making materials. Great for many applications including casting figurine...

Learn the easiest method for duplicate your hollow parts!

Step 1: Remove the Master

First Remove the hollow master from the mold.
The center of the hollow piece was also molded and used.

Step 2: Thin and Slow Curing Casting Material

Clear Casting Plastic is used as an example of a thin slow curing casting material.

The steps include:

  1. Prepare the mold with mold release.
  2. Place toothpicks in the mold to hold the mold core exactly in the center of the mold making sure there are voids all around the core.
  3. Mix the Clear Casting Plastic 1 part A to 1 part B by weight or volume.
  4. Pour the Clear Casting Plastic and wait 24hrs for it to cure.
  5. Remove the part from the mold.

Step 3: Thin and Quick Curing Casting Material

Wax Is used as an example of a thin quick curing casting material.

The steps include:

  1. Chill the mold (preferably in a freezer).
  2. Melt the wax and wait for its temperature to fall below 170F.
  3. Pour the wax into the mold slushing it around covering the mold evenly.
  4. Wait for the wax to cool.
  5. Remove the part from the mold.

Step 4: Semi-solid Casting Material

Clay is used as an example of a semi-solid casting material.

The steps include:

  1. Prepare the mold with mold release.
  2. Push the clay into the mold.
  3. Remove the piece from the mold.
  4. Smooth out the imperfections.
  5. Wait for it to solidify and then fire the part in a kiln.

Step 5: Thick Casting Material

ComposiStone is used as an example of a thick casting material.

The steps include:

  1. Prepare the mold with mold release.
  2. Mix the ComposiStone 1 part water to 2.5 parts ComposiStone by volume.
  3. Pour the ComposiStone and brush it around with your hand getting all sides evenly.
  4. Wait 1 hour for it to solidify.
  5. Remove the part from the mold and let sit for 1 day before painting.

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    2 Discussions

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    peter.angel2

    3 years ago on Introduction

    Sorry if this sounds like an obvious question, but where do you buy bread ties from? Ive searched on ebay and found none. Are they called something else? Pete

    1 reply

    Thank you for your question!

    You can find them on eBay but you have to search for twist ties instead of bread ties.

    Out of curiosity, how is the project going?