Easy How to Mold Cast and Duplicate Your Wood Carving With Concrete

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 duplicating your wood carvings!

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: Prepare Your Carving

Shellac or any appropriate sealant can be applied to the carving. Once the sealant has dried the carving should be glued to the bottom of a mold box/container to prevent it from floating. Then coat the carving with a very light coat of mold release, if excessive amounts are used wipe away the extra.

Step 2: Create Your Mold

Melt the ComposiMold in a microwave, double boiler, chocolate melter or any other method that does not allow the ComposiMold to be in direct contact with temperatures exceeding 200°F. Once the ComposiMold has melted spray your carving with a medium coat of Bubble Buster and pour the ComposiMold while the Bubble Buster is still wet.

Step 3: Prepare Your Mold

Once the mold has cooled and feels like rubber cut down one side and stretch the mold so you can pull the carving out. Once the carving is removed seal up the cut with tape. Now spray the inside of the mold with a very light coat of mold release (cooking oil will work).

Step 4: Prepare and Pour Your Casting Material

Use a mix ratio of one part water to two parts ComposiStone. Next force the ComposiStone down the legs using a syringe or just vibrating the mold. Once the mold is full tap the mold until the ComposiStone smooth’s itself out.

Step 5: Remove the Model and Enjoy

Remove the ComposiStone model from the mold approximately two hours after pouring. Then paint and enjoy your new creation!

Be the First to Share


    • Made with Math Contest

      Made with Math Contest
    • Cardboard Speed Challenge

      Cardboard Speed Challenge
    • Multi-Discipline Contest

      Multi-Discipline Contest

    11 Discussions


    4 years ago on Introduction

    If you want even better results, you can use a bigger jar with a lid (needs to be airtight). After pouring the ComposiMold, apply a vacuum to the innerts of the mold (by drawing air out of the jar with a hole in the lid you previously made). This expands the bubbles and allows them to rise away from the object and flow to the top.

    This also removed big parts of trapped air in small details like the face of the figurine.

    Better mold = better cast = more joy :)

    2 replies

    Reply 4 years ago on Introduction

    Thank you for your suggestion! Just make sure ComposiMold stays up to temperature the entire duration a vacuum is being applied. Out of curiosity what types of objects do you mold and cast?


    Reply 4 years ago on Introduction

    I didnt mold and cast lately... Made it as kid (15+ years back) but remembered this lesson from my dad... :)

    May soon cast plastic-resin for a bowgrip of my W&W InnoMax.


    4 years ago

    I like this a lot! I've just gotten into casting cement myself. I always love what detail can come out! Great job!

    2 replies

    Reply 4 years ago

    If you get a chance I would love to see your projects, Cement casting is so much fun! Thank you for your positive comment!


    4 years ago on Introduction

    ComposiStone works great with ComposiMold, and plaster of Paris works best with ComposiMold when an exact mixture of 73% plaster by 27% water by weight is used. If scales are not available, make the mixture pourable but as thick as possible.

    Thank-you for the comments

    Sweet Gherkin

    4 years ago

    Just don't use regular plaster of Paris as your casting material. The composimold material is somewhat water soluble, and will stick to you casting in little pieces.