Your best bet is to make sure the surface is perfect (or as close to perfect as possible) before you apply the Zaino. Of course, this holds true with just about any detailing product, IMHO.
Z5 is rumored to have some swirl hiding capabilities, and while it's better at it than Z2 is, I'd still suggest using a 3M SMR, or similar before going the Z route.
Once the surface is prepped, the Z will look great on it, and protect that perfect surface for quite a while.