You should pick up the Z-6 too. Apply it between every coat of Zaino, plus use it after a wash to keep your shine looking brand new. If you want some serious info, check out the forums on www.autiopia.org, tons and tons of great info.
Z-6 definetely rocks! It maintains the gloss and protection so you don't have to reapply Z-5 all the time. Just wash with Z7, spray on Z6 and you're good to go. The smooth feel of the paint finish will be back again and again. Check out pics of my ride with 15 Zaino coats on my website in my sig. I love Zaino.