I personally don't use Z6. It does nothing to extend protection. But it sure does Shine!
It's a good product and all, but I don't need the last possible bit of shine anymore.
Now, I have used it.
I have told this story many times before so my apologies to those who may be reading it for the umpteenth time.
In 2000, I was living in Port St Lucie and entered my 99 Miata in the Annual Concours de Elegance Car Show at Ft Pierce.
It had about 10 coats of Z2 on it (Culmative over about a year) so I did the whole thing with a bath of Z7 and a final coat of Z2. Then, just before, and during, the show, I used a spritz of Z6.
I won the "Late Model" Concours.
I barely beat out a Black 1998? Corvette which had a ton of Meguiars on it. The judges got it down to us two pretty quick, but they went back and forth several times before they motioned that the Miata was the winner.
It looked like a perfect Red Miata...... sealed in glass.
I always figured it was the final spritz that won........but it could have been several other things.
I used the Z6 up and never bought any more.
Meguiars has a spritz too. Same deal, just an "enhancer".
They DO work.
I'm just satisfied in the job that Z2 does.
I really don't care what everybody uses.
And Voltage Insulator wax from a specialty company is fine with me.
I do suspect however that Insulator Wax has different requirements than auto wax that is put on polymer paint.
Now if I drove a late model insulator.........

But read up on "Polymer versus Carauba Wax".
In fact that makes a good google.
You will come across Barry Meguiars take on it, and he makes both kinds of products.
Again I say, there is nothing wrong with Carnauba. (My favorite is P21 over a Z2 finish), but Carnauba just cannot protect as long as a polymer.
Physically impossible.
One lays on top the paint, the other bonds with the paint.
One can be removed using Dishwashing soap, the other can't.
Homer