> Barium Sulphate is nothing new (…) It is not the easiest thing to work with, and is not at all durable I only read the abstract, but it seems like they’ve co

> Barium Sulphate is nothing new (…) It is not the easiest thing to work with, and is not at all durable I only read the abstract, but it seems like they’ve considered your stated limitations. “we experimentally demonstrate remarkable full-daytime subambient cooling performance with both BaSO4 nanoparticle films and BaSO4 nanocomposite paints” “providing great reliability, convenient paint form, ease of use, and compatibility with the commercial paint fabrication process.” Also, you can always get commercial licenses for restricted substances like ethanol; that’s not an actual problem for house paint jobs.