The foam mold portion of this process went well. Perfect on the first try... but then the liquid plastic portion of this adventure kicked me down a peg from my feelings of success.
The plastic filled and overfilled the mold until I was left battling an ever expanding amount of sticky plastic goo that thankfully had a plastic container collecting the excess rather than the kitchen table.
Eventually I discovered that positioning pencils under the mold would keep the flow inside.
The plastic was supposed to dry in about 15 minutes but the next day I was still left with soft and sticky shapes that began to bubble and expand like cancer had taken a turn for the worse.