[freebeard]

NightHawkInLight gives clear instructions for making the stuff:

Making Infrared Cooling Paint From Grocery Store Items (w/Novel CaCO₃ Microsphere Synthesis)

It's an interesting story; he goes down a wrong path for a while and learns things he wouldn't have otherwise.

It's a scalable process, from beakers to 5-gallon buckets. With suggestons for application.

Works best where it can see the sky but is still in the shade.