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cool
I college,I sewed an all roof cover for my Karmann Ghia.I used aluminized plastic honeycomb radiant barrier material,tailored to fit the contours and ran it through a second-hand gear-drive Singer sewing machine.Sand filled plastic bags within cotton socks,attached to grommets with shoestrings held it on even in very strong west Texas winds.
I never documented the temps but my testimonial would be that it was very effective in blocking any UV from penetrating the glass where it could convert to infrared.
Also,upon entry,you did not sense the radiant load from the roof above,dashboard,or other surfaces,as they were at basically the outside air temp,but not a solar-heated temp.
The downside is,that once the cover is off,the cabin immediately begins to heat.
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