or Z-5 is taking hours to dry. What’s wrong?
Sounds like you applied it too heavily. A neat trick that helps you get even coats without having to load the polish up on the paint is to lightly dampen your applicator pad, spray a couple mists of Z-6 on it, then put a few thin stripes of polish on it and spread the polish evenly across the face of the pad with your fingers. The object of applying the polish to your car is to get on thin, even coats. Putting it on heavy only wastes polish, and slows the dry time. Also, keep in mind that cool temperatures or high humidity can lengthen the drying time of Zaino polishes.
