Patpur - I actually have both z6 and z8. I personally feel that z6 does clean and slicken the surface, while z8 adds even more slickness and more gloss, and it beads well for the short time that it lasts. I could certainly tell the areas sprayed with only z6, and areas sprayed with z8. The difference in appearances between the two products probably vary from color to color. Yeah, z8 certainly smells good too and it is much more expensive. I haven't tried their clear seal product yet. Their ZAIO is pretty good too, but it doesn't clean the paint as quickly and effectively as Optimum poliseal. But, I will probably be getting ZAIO to create a base for z6 and z2 pro.