This tutorial shows the process of creating a two-part polyurethane rubber mold of a wooden baluster. In this case, concrete will later be cast in the mold.
The Two-Part mold making technique can be used on a variety of models, and a wide range of casting materials could be used in place of concrete (e.g., polyurethane foam, polyurethane plastic, rubber).
Tutorial: https://www.polytek.com/tutorial/how-make-two-part-rubber-mold-baluster
