Did a project with my kids a few years back. We melted them down in a coffee
can set in boiling water. Then poured them into tin cookie cutters set on a
foil-covered pan. Can't remember if we sprayed them with vegetable oil, but
I don't think that would hurt. We let them set then popped them out.
They gave them to friends as gifts. We still have a few of them around.
Robin in PA