What to do with the rest of the expanding foam in the can...make a pumpkin!
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Spray out your excess foam into roundish form. Make it as big or small as you want. Let it cure over night and make sure it is firm.
Once it has cured and is hard, paint it orange. Put it on the end of a pencil to hold on to so that paint will not get on your hands.
Draw your face. Use a Sharpie marker.
Carve it carefully with an sharp knife and be careful. Clean out the inside.
You can also add a small led light inside.