My first attempt with casting 1:1 plastic casting went pretty well. I created one of the lion medallions that I had shaped from sculpty. I noticed some imperfections that need to be fixed, but I think this shows that it will work quite well.
I did some more work with silicone molds. About ten years ago I created a jewelry piece for a Kagato cosplay from sculpty. Unfortunately, it broke recently and while repairable I'm afraid it won't hold up much longer.
I decided to make a silicone mold of the piece so I can cast a new one in plastic.
I added left over silicone to the bottom of the other mold, it was a bit to thin.
I'll unwrap the molds tonight and post a few updated pics.