Great Stuff Foam / Halloween Fire Prop with Cauldron

Great Stuff Foam Project / Made a Halloween Fire Prop with Great Stuff foam, it includes a Cauldron all for under 18.00.
Link for the Great Stuff Foam:
www.lowes.com/...
Use the Gap & Cracks or the Big Gap ...Don't use the Walls and Window can it doesn't harden like the Gap & Cracks or Big Gap....