The best two things to use over Souveran (for me) have been Pinn. Crystal Mist and FK425. Or CG 1X carn. waterless wash diluted 1:1....the synthetics don't seem to do so hot over the heavy 'nuba.
Z-6 is Zaino's quick detailer. Z-8 is their version of a spray sealant. Either one is not really meant to use on top of a wax. They are pretty much best used with the other Zaino products.
Crystal Mist is a fantastic (albeit expensive) carnauba detail spray. It smells awesome. Well, I haven't had any of the reformulated stuff, but the old stuff smelled great.
Well, I have some Crystal Mist as well, so I will just use it instead and save the Zaino stuff for the Subie....
Mark
BTW, My bottle of Z8 sat for a while and appears to be seperated with cherry red chunks floating around in the bottle. A good shake doesn't seem to get it all back in suspension either. Is it still good?