Silicone Casting Adventure

Silicone Dreams.

morals of the story:

“just because we can pour more in a cup, doesn’t mean that we necessarily should pour more in a cup.”

“there is a very good reason why they told you to shave your arm”

teamwork, teamwork, teamwork.”


We all have heard of it and it definitely is a material that has a learning curve. how did three amateur students manage to not only successfully cast a whole arm in one try but to do it with the least amount of ~injuries~?

Notice Da Model excitement.

Well, this is how we did it:

First, we poured parts A and B into different cups and stir it for about 30 seconds. We just want to make sure it is well incorporated but remember, the more you work it, the faster it cures, and before you notice it you have this purple blob in a cup.


See how much mix I poured into that cup? that’s close to 6 ounces!!! Way too much.

Then, pour both parts A and B into a new cup and stir thoroughly. When pouring, try to have a long thin streak of the mix is better, that way to avoid bubbles.

Here is a pro-tip: don’t do it unless you are really into arm exercises. Which brings me to our first lesson:


“just because we can pour more in a cup, doesn’t mean that we necessarily should pour more in a cup.”

-Wyatt Laster.

You can see the video here.

When both parts are mixed homogeneously, you can start the 1st coat. Pay attention to the details, especially the fingers, where is hard to get silicone and the palm where the silicone rests the most for the concave shape hands naturally have.

Let gravety help you as much as possible.

Use silicone pigment to change color for each individual layer. We brushed a total of 3 layers and we used green and black to dye for the second and third layer respectively.

For the bottom part, we waited for the silicone to cure a little bit longer in the cup that way it was very sticky thus gravity, who was our friend in the beginning, wouldn’t bring everything down.

We created an extra thick layer so we could cut it to release the arm. It ended looking like this:



the mold looks great and it’s ready to cast!



One comment on “Silicone Casting Adventure
  1. Laura GONZALEZ says:

    This is an amazing exploration! And you’ve catalogued everything so well! It would be very helpful to replicate this process using your blog!