I vote for radium paint.
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it would certainly be hot in the sun
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Black in the sun is hot
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Channeling Henry Ford: "You can get it in any color you like... as long as it's black."
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Black will absorb the sun’s heat and will make the wall even more beneficial.
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Really Black .... Black absorbs lots and lots of heat. This will add a thermal deterant to scaling the wall as well.
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Put solar panels on it. It would actual return money over time.
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