"Thanks BW...for the clarification...i don't know much about their products other than what I'm told or read..."
Then how can you make statements that your EX Sealant will stand a chance against Zaino in terms of durability? It sounds like you have absolutely no personal experience using Zaino.
Your product, as stated earlier, is an amino functional polymer with Carnauba. While many people like the carnauba appearance it does nothing to enhance durability. I believe it will actually decrease how long it lasts. Unless your product is using some new breakthrough process/chemicals I believe Steve's results are quite reasonable.
I can't for the life of me understand why a polished surface will increase durability as compared to applying to a completely clean surface free of waxes, dirt and oils. Maybe you can explain or ask your chemist to give an explanation.