No but neither do Seibon.
They don't say clearly on the parts pages this part isn't for outdoor use, there aren't any clear warnings.
http://seiboncarbon.co.uk/products/carbon-fiber-fenders-for-2009-2010-nissan-370z-10mm-wider.html
If you read this page for the fenders/wings, it includes this line:
"For a stunning finish, our products are coated with a glossy clear coat that does not chip or flake."
It doesn't say but you must garage your car or if you can't leave it outside.
It doesn't say not for road use, it doesn't say will need additional protection.
Where is the UV/sunlight warning?
The only place I can find any reference is on the FAQ page, it really should be made clear.
And more to the point, why does all the rest of the carbon on my car that I look after in the same way, look so much better?