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hmmmm.... elastomeric coating on roof on car.
interesting idea.
Might make it a bit cooler when you get in.
The local hardware store had a neat display going--- two plywood boxes w/ a glass front and thermometer inside.
each had the same zinc/steel roofing over it. One was painted w/ a white roofing paint, the other was ... zinc colored. The temperature difference inside the two on a sunny day was dozens of degrees. I don't recall exact numbers, but on an approx 100* degree day (its hot here) in the sun, the plain roofed box was over 150* and the painted one was down by 120-130*. I don't recall how well sealed the boxes were nor if there was breeze that day. That's a pretty big difference. I suspect that the effect is even stronger as you get a larger surface (ie: the little box radiates a lot of heat and is thus closer to ambient temps vs. an entire house roof)
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