Quote Originally Posted by PearlieMae View Post
Aino, if you're going to do your scales in sections like I am, you're going to need something more sturdy than ultracal. It just won't hold up. You will need to use something durable, like urethane resin, but on the plus side, you won't be using very much because your molds will be so much smaller.
I thought that might be the case. I guess ultracal is ok for a one-time mold like a scale sheet but it wouldn't work if you intend to re-use the mold a lot. I hadn't really considered urethane resin until reading this thread. Does it matter what type of urethane resin you use? I have been looking at the websites for local suppliers and there are a lot of different types!