Jon, take a look at this stuff. I have a couple packages of it that I use when I either want to just make a couple of something or I am experimenting with the mold design/layout.

https://www.amazon.com/Amazing-Casting-Products-Extruders-2-5-Pound/dp/B00LZXVYF6

It hardens as it cools, so it is ready to cast in pretty quickly and it is reusable so it pays for itself in materials fast.

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