Greetings James, and welcome to the Forum !
Heard of it, and, the stuff you spray in your Attic too. Never used either of them.
I guess i'm a little "old school" when it comes to Insulation, like Engines, the only replacement for Cubic Inches, is MORE cubic inches, or more efficient ones anyway.
Just can't see how a few thousandths inch of Paint, would provide one with a substantial improvement in that area.
As you, I hope we can get a good Topic going on this, and all become better informed.
Thanks for joining us.
Have a good Day !
S.W.