How to Make a Casting Mix

How to Make a Casting Mix

Materials + Supplies:
    •    Mixing Container
    •    Rubber Gloves
    •    Particle Mask
    •    Mixing Stick
or Trowel
    •    ShapeCrete Mix

    •    Water

Castable Mix Ratio:
    •    Approximately 3 Parts Mix : 1 Part Water


How to Make a Casting Mix

ShapeCrete becomes castable with a slight increase in water content.


3 Parts Mix : 1 Part Water

Measure out 3 Parts ShapeCrete Mix and 1 Part Water.

The ratio of 3:1 is approximate! Adjust the water content as necessary.


STEP 1: Pour Half the Recommended Water in the Mixing Container


Pour half of the water in the mixing container. Set the remaining water aside. Adding water gradually will ensure you don't get the mix too wet.


STEP 2: Add the Mix

Add the first cup of ShapeCrete to the water. Mix thoroughly and then add the second cup. Continue mixing and then add the last cup of mix.


STEP 3: Add Remaining Water as Necessary

Gradually add the rest of the water as needed. Be sure to scrape the sides and bottom of the mixing container until there are no dry clumps of mix.


STEP 4: Mix Consistency

Test the consistency of the mix by scooping it up. If it is runny, but not watery, it is a good consistency for casting.

  • If it doesn't run off the stick or through your fingers, add a little bit more water.
  • If it's too wet, add more of the dry mix.




After the mix has reached the desired consistency, pour it into your form. If you leave the mix to set for a few minutes, it will stiffen up. You can loosen the mix back up by stirring it again and adding a little bit of water. In a shaded environment you have about 30-60 minutes of work time.

If there is water pooling on the surface of your poured project, your mix was too wet. Too much water could weaken your project and produce lesss than ideal results. 

It is always a good idea to cover your project with plastic while it cures. This will help keep moisture inside which will help prevent surface cracks.

For best results, always allow your project to cure for at least 24 hours before removing it from the mold.

Check out the Project Guides Page for some ideas about what to cast.


Learn how to mix ShapeCrete to a Clay-Like Consistency.

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