My wife bought some "Amazing Putty" ( http://www.amazingmoldputty.com/ )from hobby lobby last night, along with the resin from the same company. I had planned on trying out the oomoo stuff but she beat me to the punch.
On one of their videos they cast a seashell in a two piece mold, but never show how to do the two piece mold. I don't want the first part of the mold to stick to the second when I do it, so I assume I need mold release. What could I use for mold release? Would a thin piece of smooth tinfoil work?