This log is a piece of a dead tree that fell across my driveway in 2021. I set it aside and didn't get around to casting it until 2023. The log was sealed with resin-soaked rags and silicone. Silicone was poured in and dumped out to line the tunnels and prevent resin from seeping into the wood. There was no reasonable way to remove the cast from the wood, so I let it rot for three years first. It was still a pain to remove but the wood was soft enough to remove relatively easily.

Resin: Smooth-On Smooth-Cast 327
Silicone: Smooth-On Ecoflex 00-30