To be realistic, there will always some type of "post prep" performed directly after polishing inorder to use a sealant directly after polishing. Most sealants will not bond effectively to polishing oils left behind. A simple 50/50 IPA-water wipe down does the trick. Or in some cases, a good QD wipe down. You could also use Klasse AIO post polishing as a base for any product, albeit a sealant or wax. With that being said.......Based upon my experience, Zaino is the most durable sealant I've ever used, by far. Don't be affraid of mixing a few drops of ZFX with Z5 Pro or Z2 Pro. A simple 90 second shake of the ZFX'd Zaino is hardly a chore. Well worth it! In addition, Zaino really doesn't require a topper on it's own merits. A good QD spray is all you need to maintain the finish. Z6 and or Z8 is all you need for post washing clean ups. Heck, any quality QD will do ( #425, Quickshine etc.) if you're just planning on applying a sealant once & maintaining the initial application for the months to follow. When applied properly, expect 6+ months of premium durability from the "Z".
But the question remains for most of us...........Can "Autopians" really keep our hands off our vehicles long enough to see the "end" of Zaino's durability??(lol)
There are plenty of quality sealants out there, that I've used. And I don't want to "slight" any of them. FMJ,UPP,KSG,AJ,CG FS& CG MS, #21 etc..... are all quality products. But if your looking for my personal opinion, Zaino's the one! (atleast until RDF comes out.)