I'm not a pro - far, far from it - but I recently used Rejex to a) coat the windshield of my wife's '03 Honda Odyssey, and b) seal my new black sapphire metallic BMW X3. Now, when I say I'm far from a pro what I mean by that is that I am almost a total noob, or was when I got the X3. I've learned quite a bit in the last two months both here and on other boards.
My wife's van is a mess. She drives it down dirt roads several times a week and smokes in the car. I had to drive it back from the dealership one day in a pounding rain and visibility was so bad I could barely do 45 on the highway without over-driving my limit of vision. I had just got the Rejex in the day before, so I decided to use her windscreen (and front windows and mirrors) as the guinea pig for the product. First I scrubbed the glass with 3 applications of Stoner's - yes, it was that dirty. Once I could see through it properly, I applied the Rejex. It went on easily with a foam applicator. After waiting, per the directions, for 15 minutes, I buffed it off with an MF towel, and it came off easily. The glass was crystal clear and very slick. The next time she took it out in the rain, she couldn't believe how much better (and safer) it was. Rain just shot off, and her visibility was substantially improved. I haven't seen it for myself, but I believe her, especially as she thinks my recent obsession with car care is crazy.
Pleased with the test run on the van, I proceeded to the X3. The first thing I did was the wheels, because I've heard very good things about Rejex as a barrier against brake dust, the bane of Bimmer drivers. Also, I had a convenient 90 minute window one evening to get it done, and I knew I couldn't do the whole car in that time. So I treated the wheels with Meg's Hot Wheels, scrubbed all the brake dust off the visible portions - I'm not set up to take my wheels off and do the insides - rinsed, dried, and applied Rejex. Again it went on easily and buffed up easily, leaving the rims shiny and slick.
The next day, I had time to do the rest of the car. It had already been washed, clayed, and polished with Klasse AIO two weeks before, so I just opted to treat for bugs and wash before applying Rejex. Again, it went on easily. I waited the 15 minutes for it to haze up, and started buffing. Again, pretty easy. But I noticed that I kept missing spots and had to keep coming back, especially because the light in my garage isn't great, so it took a little longer than I would have liked to finish up. The results still looked and felt pretty darn good, however. That was about two weeks ago. The other day, I did a waterless wash with CG One, and the results remained very satisfactory.
There is one problem, however, which goes back to the wheels. Once I started driving it again, I noticed brake dust on the rims in odd patterns, kind of like ripples that you might see in mud at the beach. The dust comes off with soap and elbow grease, but it's not the wipe-off with a duster carefree finish I had hoped for. I wonder if I didn't buff the rims sufficiently and left too much sealant to cure up on the rims. It wouldn't surprise me - that's a rookie mistake and I'm a rookie. I need to improve my buffing skills. I'm still not clear exactly how much pressure to use, and I'm sure I miss spots.
If I knew the easiest way to get the Rejex off my rims, I might have another go and be more thorough to see if it lives up to the praises others have heaped on it. Does anyone know whether wheel cleaner will take it off?
So, as to grading it, I'd give it the following:
Glass: A
Paint: B, but room for improvement
Rims: C-, but significant room for improvement
Hope that helps.