I chrome-wrapped my roof at the end of last summer. The problem with red paint is that it absorbs the higher-frequency (and higher-energy) end of the visible spectrum; that's why on interstate signage, the red part always fades long before the blue does. So, if you want a color other than white or silver, something toward the blue end would probably be best.
I'm not sure how much the chrome wrap is actually doing, but if I can find someone else with a silver Prius this summer it might be fun to leave both of them in the same parking lot and monitor the interior temperatures.
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