Ah yes.........to top the "Z" or not top the "Z"?????????? Zaino purists top Z5 Pro / Z2 Pro with Z8 only. IMO, there's really no need to go outside the "Z" system when using it. It all comes down to personal preference, I guess. For instance, I've got the Z2 Pro/Z5 Pro/Z8 combo on my black "C" at the moment. As it stands, my car's finish is good to go through the ultra mild Texas winter. Weekly Z7 washes followed by Z6 or Z8 will keep my car looking terrific & quite protected for months to come. But here's where I share your dilema, Chili.............I'm a carnauba junkie!! I just love the depth & wetness that a quality nuba produces. Let's face it.......There's plenty of quality sealants out there. And the Zaino system tops most peoples lists. But to my eye, there just isn't a quality sealant on the market ( and there shouldn't be, when yout think about it. Sealants & carnauba waxes are apples & oranges. ) that exactly duplicates the looks of say CG 50/50, Souveran, Natty's Blue, Trade Secret, P21S, Meg's #16/26, FK Pink Wax, DP Max Wax, CMW......etc. Sealants may come close, and Zaino looks tremendous on my black car, but I too am looking for that rich-dripping wet depth & wetness that only a quality carnauba provides me. ( to my eye, atleast...... ) I use sealants for their superior protection. I use nuba's to achieve the looks I desire. At this very moment, I've got all I can do to keep myself from running outside on this beautiful 75 degree West Texas day & massaging a layer of Souveran or Natty's Blue over the 3 week old Zaino system that took me 2 days to do. That being said..........DO IT!!!! ENJOY IT!! Others may disagree.......but there really is a difference ( on dark colored paint ) when the "Z" is topped with a beauty wax such as Souveran. I did it last year with mouth watering results. Souveran won't strip the "Z". You've got nothing to lose. ALL HAIL THE NUBA!!!