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Cooling Paint: How to Make Surfaces Stay Cool in the Sun
(www.youtube.com)
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this post was submitted on 29 Nov 2023
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You're right: it's probably not practical to paint a building with the stuff. Nighthawkinlight briefly comments on this. I believe the idea is to use it on passive radiator panels to sink heat from a pumped coolant fluid. That way you can strategically place panels (e.g. on the roof) and control them, just like solar heating panels.