I made a mold of a small bottle and cut it in half and have been casting these halves of bottles to use in a piece. I am using Durham’s Rock Hard Putty as the casting medium. It sets up very rock hard as the product name implies. To make sure they do hold up I inserted a piece of bamboo skewer into the plaster while still wet and pliable. I’m not sure what else I’m going to do to them. Stay tuned.