This guy has some great skills we can mimic as lure makers.
His two videos explain the tools and techniques used in the Vulcanizing Process.
This method should cast most stuff we use: Soft plastic, hard plastic, lead etc.
1. How Miniatures are Born https://youtu.be/IYVIVzCmH10
2. Vulcanizing Molds https://youtu.be/70QGqNMPZJw