Use what you like, Zaino tops them all. If you want professional show car shine, you will get just that with Zaino. I have a friend who professionally details. He uses NOTHING but Zaino products. I've seen him take first place EVERY car show he has been a part of.

As for using something over it. Why bother? I was specifically told NOT to use Zaino before applying the 3M clear bra. The installer said he had a rough time getting it to stay in place. Damn good wax