I called Detailer's Paradise this morning. They said that there are no oils used in Prima Amigo to worry about. They said that Sal even sent them some Z-2/Z-5 to test its compatibility. They said that they did not experience and bonding issues. The Z-2/Z-5 did not wash off, however they did say that they did not monitor its durability 4-6 months down the road.
They did say that it is finer polish than FPII, its cleanser ability is on par with
AIO and its filling ability is significantly superior to Z-5Pro.
I'm going to order some and use my own car as an experiment before using it on a customer's car. I usually put 10-12 Z-5/Z-2 layers on my black Volvo (2x a year) so I hope I am not going to waste it all and see it wash off the car.
I'll post some before/after Prima Amigo pictures. We'll have to wait a few months to see if the Zaino durability is compromised. ( I probably should have done this in the spring incase it doesn'y last and I end up witha stripped car in the middle of winter)