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Nissan develops paint that keeps cars cool in summer heat
(www.asahi.com)
This is a most excellent place for technology news and articles.
Miata, BRZ, GT86, possibly a WRX if you want something more practical.
Already considered all of those before buying the Z. None of them meet my horsepower requirements. And the last time I checked, they don't make a convertible WRX and BRZ/FRS/86.