I say leave the Zaino off until after the clear bra is installed. If you want it adhere properly and do it's job without coming off, don't Zaino yet.
You might as well clay bar the entire car before sending it to get the bra put on. At least you know that the surface prep was consistent across the entire car, even under the clear bra. Once the bra is on, then wash the entire thing and Zaino the heck out of all of it.
At least, that's my opinion and what I'd do.
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