there's only so much moisture a coat of paint can hold. Zaino is ok, but its way too expensive. Extreme has been in the body/paint repair biz for 14 years. He just put a buff job on my car that would make you zaino boys jealous...all in about an hour and a half...there's not replacement for a good rubbing compound followed by a good polish by professional hands.
Do yourselves a favor and get off the zaino kick...the same shine can be had for less $$$ from a nice wash, and a fresh coat of Meguiars Gold Class for a fraction of the cost.
