I have noticed that after i apply Z8 to my car, couple of squirts per panel, i will get what feels and looks like salt crystals that form on my paint all over the car, some time later. You can feel them on the surface, and see them if you look really close. So, what i did was went around the car with the plush side of my microfiber, and wiped the car down again, after the initial spray and wipe with the Z8, no crystal formation. Well, today i did a Z7 wash with the Z8 wipe down afterwards but just with the inital spray and wipe, and sure enough about an 1 1/2 hours later the crystals were manifesting. They wipe off with no problem with a damp microfiber or Z6 wipe down. I guess the moral of the story is make sure you really wipe down your car really well after a Z8 application.