My car is silver, which is tough to get looking wet. I would think that the spray wax would be fine on white, but a nightmare on black. As you pointed out, you may have gotten a good bottle...or I could have bought a "bad" bottle. I could not believe how dusty it got...and it is fairly humid here in Atlanta!
Overall I've been disappointed with the NXT line. The car wash is fine, but the interior detailer is a bit too greasy for me. The whole line does smell great though!
I tried doing Deep Crystal Paint Cleaner, Deep Crystal Polish & then NXT on the rear of the car - which gave much better results than my initial wax job with NXT after clay bar...The spray wax seems to like it better too; washed the car yesterday and that portion had much more protection. I'm sure the answer is in chemistry.
The wet look only lasted 4 days so I'm going to remove the wax, use Sonus clay bar, Sonus Paint Cleaner, Klasse All in One & then Pinnacle Signature.