As I live in Rio where the summer is very hot and my Exy is black, I'm seeking help. I've thought of simply having the roof painted white. Another solution might be to tie white canvas with eyelets and strong chord to the 2 basic roof rails. Perhaps better would be to fit an upper aluminium roof, about 2cm above, like many traditional Land Rovers. The sun would be kept off the original roof and air would blow through the space. As on the Land Rovers mentioned it'd be important to have the leading edge sloping slightly down so that wind would not tear it off. Have you ever done or seen something like this?