I ordered some Z-5 polish but I didn't see anything on their site for protection/sealant. I "thought I only saw polish's"
The labeling of Zaino products is a little confusing. They call Z2 and Z5 "show car polish", but these are actually sealants. I think they call them polish because that is a term the "common man" is familiar with. Neither has any cleaning or abrasive polishing abilities.
Common wisdom says Z2 is best on light colored cars, and Z5 looks good on darker paint and has some swirl-hiding abilities (although I have found it doesn't do a very good job at this). Either Z2 or Z5 is actually fine for any color paint, but some people prefer one over the other.
To get the Zaino (Z2 or Z5) to bond to your paint, you should ideally use either ZFX (a catalyst that speeds up the curing, and is added directly to Z2 or Z5) or use Z1 (Z1 is wiped onto the paint before application of Z2 or Z5 and helps them bond). That said, I have gotten decent bonding without ZFX or Z1 by putting down a base of AIO first. I apply Z2 or Z5 right after I remove the AIO residue. So if you don't want to order any more Zaino products you could try this combo as soon as your Z5 comes in.
Also, go to the Zaino website and read through all of the directions, instructions, and tips & tricks. This will give you a good understanding about how the Zaino "system" works.