After reading some posts I came to the conclusion that a coat of zaino then some of the NGX is a good idea. I clay barred the car last summer when I did the meguirs yellow # 26 so I dont have a whole lot on there right. Water barely beads. Think this is a good idea?
If NGX=NXT then no you won't need to top one sealent with another. NXT does contain solvent (although very little) it may take away from the Zaino. One coat (or multiple) of Zaino will be more than enough. Besides NXT doesn't seem to last very long for most people.