I have read great thing about vinylex but I have also read (also going to buy) 303 Aerospace Protectant is far better it has a SPF rating of 40. Do a search on www.autopia.org for both product and read the reviews. From what I've read and researched 303 is slightly better.
i used vinylex on my 00gt's top, the only thing i hated was when it rained all that stuff would run down and look like crap on the car. Made the windows a pain to see out of and was some what of a pain to clean off the windows