Well, it's been over a month with Z on the silver STS and Black Tahoe.
Here are a few observations (based on my use):
Pro's
-Slickness retention is excellent. We've had rain every other day for the past 3 weeks, and this is usually takes a toll on your LSP. Z holds up. It's not as slick as day1 (after over a month of use), but it's far above any other LSP product that I've used.
-Rain Splatter. This week it rained just about every evening, and the roads were wet most every morning -tons of splatter. Z repels rain/staining better than anything I've ever seen. The wells, tires, and rims were covered in film, but not the paint -no kidding.
-Bird Sh**: The Tahoe is black... and I don't want to wash it every day because of the color (marring), and because of the mass. I had bird crap on the hood (lots of it) for 3 days, and when I rinsed the truck it lifted right off and didn't leave a stain. -I have to admit, I was ready to break out some FPII to clean it up, because I NEVER let bird sh## sit on my paint, but thankfully I didn't have to. (If it was summer and full sun, I would have caved in and washed it off).
-I've never seen anything rinse as clean as Z. After the rain, etc... the hose jet cleaned off any (and there wasn't much) noticeably signs of dirt uniformly
No caking, no patching, etc.. -the paint appeared noticeably clean after the rinse.
Cons:
-N/A on silver paint. I still think FK has more 'pop', but other than that, I have no complaints.
-For some reason (I have no idea), after a wash, the paint slickness doesn't return unless it's 70 degrees or above (I know this because of my garage heater). When you wipe down cold paint, it doesn't feel as slick -but it does return. ???
-On black paint: I had some slight marring on the lift gate, and door frames (where my wife touches the paint), and a few areas around the fenders. Black paint is he** -especially in direct sun -there is no forgiveness!! The moral of the story here is... Z doesn't eliminate marring on black (at least not for me).
To deal with the marring:
I used ZPC on the PC with a Polishing pad -1 pass didn't clean it up as well as I wanted. I stepped up to my cyclo using ZPC, and polishing pads and 1 pass cleaned it up. I re-applied Z5/Z8 -good as new.
Overall View:
All things said.... I'm VERY happy with the Z sealers (Z2Pro, Z5, Z8). The only other sealers that have performed in this league on black paint (again IMO), are FK#218/2180. All others have faded MUCH quicker.
Guys, I still use EX, UPP, WG, FMJ, #218, #2180 and a host of others (I'll never settle on 'one' look), but I have to admit.... Z is very impressive.
I started this post as a sceptic.... and that has changed.