Maguires makes very fine products! I remember back in the 70's I got hooked on the "Mirror Glaze" step process for my 510 BRE Datsun. Flagship is another great product.
For those that have newer rigs and don't need a cleaner wax and not fighting oxidation, I am still a believer in Rejex. I have a Big Country with the notorious fading gray cap! Shortly after the day it was delivered (Feb 12, 2010) I treated the caps with Rejex. Only this summer did the cap start to deteriorate and is beginning to turn white on the very top (the part I did not always reach with the Rejex). My point is, Rejex is an excellent UV protectant and our cap would have puked a year sooner had I not used it...at least that is my opinion!
Here is what the Rejex website says about UV protection...
Does RejeX contain UV inhibitors?
RejeX provides better protection against UV deterioration and fading that any wax-type product we're aware of. RejeX is a tough, impermeable polymer film, so even though it does not contain specific UV inhibitor ingredients, just by its more durable nature it’s going to outlast and out-protect wax-ype protective coatings. Waxes have a very limited life span, and as they degrade they lose their ability to protect from environmental damage. That’s why most wax-type products must add UV inhibitors. RejeX seals paint behind a polymer film barrier, which effectively retards the oxidation process. Two coats of RejeX will effectively block 100% of harmful UV. Recent UV testing on RejeX by two major protective film and vinyl graphic manufacurers showed that RejeX's UV protection qualities are so good, it can increase the life of protective films and vinyl graphics by as much as 50%