ModTop on my Duster
You can protect a vinyl top from UV deterioration by using 303 Protectant:
http://www.amazon.com/dp/B004YJQE0S/?tag=fabo03-20
Their motto is "it's like sunblock for your stuff". Use it anywhere you would use Armor All, though this is a better product as far as I'm concerned.
I still think a green mod top would be the bomb on a gold car! Notre Dame fans would love it!