Stuff the plastic cauldron with paper, Styrofoam, or other lightweight items to the rim. (This will help avoid using more insulation foam.)
Spray the insulation foam onto the top of the cauldron according to label instructions. Allow it to dry between layers. Have some foam dripping from the edges of the cauldron.
Use a flat brush to paint the insulation foam in a desired color.
Repeat the steps to make larger and smaller cauldrons.
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