The directions on Zaino's website are pretty clear. But the basic guideline is that if you're not using the ZFX, you're not supposed to apply another layer of Z2/Z5 until after 24 hours. Reason is that you need to give the wax time to bond to the paint. If you mix ZFX with your Z2 or Z5 you could just apply a layer, wait 30 min for it to haze over, then wipe off and reapply.
You could apply it as many times as you want. From my experience, it took me an entire day to put 3 coats of Zaino on the car. I used two coats of Z2 mixed with ZFX. The last coat I just applied Z5 and let it sit. The first coat of Z2 wasn't too impressive, but by the 3rd coat, it looked great!
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