So here's what I think I'm going to do.
I need some of this roof coating for my camper anyway, so I'm going to get a bucket of that. Then I'll get some automotive paint in a few colors: I'm thinking red and blue (a light and dark variant of each), black, and white. I'll get some test coupons of some thin aluminum from work, paint each color on one of them, and coat one with the roof stuff. I'll let them sit in the sun for about 3 hours (or until they all reach a steady temperature) and record their resting temp.
Any input on this test? should be some interesting data.
Edit: I will paint ONE color on each coupon.
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