ZFX isn't a polish, its an additive that you put in the Z5 or Z2 so it will greatly reduce their drying time. if you dont use zfx you'll have to use z1 so the Z5 and Z2 sticks to the paint, and you'll have to wait hours between putting it on and buffing it off. with the zfx by th etime you are done applying you can remove.

and when on the zaino site it says buffing it off, they dont mean with a buffer, they mean a 100% cotton towel or MF towel and wiping the polish off. really easy to do