My Zaino distributor told me -- when I was first getting into the Z system -- to "apply it as if it were liquid gold," because it costs about that much. He was right. Even though I'm in the U.S., where it doesn't cost as much as it costs you, I find that the tiniest, most frugal spritzing brings the shine out in my Zaino in a way that just makes her sing. Since following his advice, a bottle of Z6 generally lasts me nearly a year. That's a pretty good investiment, in my view.
I can't speak to the technical/chemical issues in your question. I hear from folks that all the Zaino products are made to interact "just so," but I don't know about that.
If it were I, and if you love your Zaino-shine like I love mine, I'd just use the Z6 -- as frugally as Zaino reps recommend -- and enjoy the results.
