BotNew56,
I just did another coat of Z2 this past weekend, that was about 7 weeks between applications. The second time around is a lot easier.
The claybar will not hurt but help. It removes all the small particles/
water spots/bug splats that are on the paint.
You have to constantly strech and fold the claybar, always keeping a fresh surface to rub on the car. Be careful, they suggest using the Z7 car wash as a lubricant, and the claybar gets quite slippery. If you drop it, I almost did several times, it will pick up dirt/sand and this can cause problems, you can not wash the particles off the bar.
I found the bar is good for one use but they supply two. I did not use it for the second application and during coating it appeared that it was not needed, it definately was the first time around.
See my post
Zaino on textured plastic trim. I tried to careful and not get any Z2 on the plastic but **it happens.