If you're using Zaino you should precede it with the alcohol/water spritz or, if you're into it, Dawn. *I* would do this with anything except Menzerna, and maybe even with THAT in case I missed something.
According to DavidB, the 1Z Metallic *DOES* contain a small amount of wax. My (very unscientific) testing tells me that it does too. The Paint Polish DOES contain a lot of oils, but not wax.
I've applied P UPP and various carnaubas (and VM) over both with no problems. Others have said that the durability of their P UPP was compromised by the stuff 1Z leaves behind, so I guess the jury's still out. I've used AIO after the 1Z polishes when I was gonna use SG, and that worked fine too. If you're worried about what the 1Z leaves behind, use the alcohol, or AIO or some other paint cleaner, depending on what your last step product is. The AIO-after-1Z goes FAST and easy, BTW. That's what *I* would probably use if I were concerned.
The 1Z polishes *DO* remove marring through abrasive, mechanical action. They DO NOT just fill marring in.
I sure wouldn't let the "filler/wax" issue discourage anyone from using the 1Z polishes, they are about as EASY to use as such products can get.