I’ve done it for making fake ancient coins - like another responder, I used a Smooth-On kit and it couldn’t have been easier. Though I was casting bismuth alloy

I’ve done it for making fake ancient coins - like another responder, I used a Smooth-On kit and it couldn’t have been easier. Though I was casting bismuth alloy rather than resin. One tip, be sure to dust the mold with talc to allow air to escape. Also the vibration table tip sounds good.