A few years ago Art Mind posted a tutorial for making a polymer brooch or ring. I thought that it would be very useful to make a mold for myself so that I could spend more time decorating my clay pieces an less time manufacturing them.
My brain was still recovering from the holidays when I decided to make a mold in a cardboard box. Yes, I thought that it would be a good idea to have plaster dry in cardboard.
Oh, and I also cooked the clay beforehand which did not help matters one bit!!
I couldn't pry them out of the plaster so the only thing to do with it was draw a face on it (before throwing it away). :-)
Thankfully, I learned my lesson and decided to follow the instructions.
Success!!