Would you not be more inclined to use a sun shade on the inside of the windscreen when leaving the car out in the sun?
Or if your a bit cheeky, get a very light layer of tint put on the inside of the windscreen. The guy who tinted the windows on my car (Hunters Hill - very popular in Sydney) had 52% tint on the inside of his windscreen - very very very subtle (basically you cant notice it) but the tint has UV protection to preserve your dash.
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