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If you were so inclined you could put a small amount of peanuts in a bath tub and see if they would stick to you. Another thing would be larger chunks of styrofoam. I would think that furniture stores have lots of pieces from furniture deliveries that you could cut to a smaller size.
If you could come up with something workable and fairly innocuous, I would think there is a market. The ski resorts around here all have outdoor spas, and a tremendous amount of energy must be wasted to keep those hot 24/7.
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