I've used 'em all from Adams to Zaino (A to Z) and I like Z-2 with ZFX

I would not suggest using Z-2 with ZFX on Harley Vivid Black paint.

Why?
Z-2 can be (at times) can be a bit stubborn to remove.
Unless done perfectly it may produce marring.
With normal harder CC Z-2 is no problem.

Another Humble Opinion
Turtle wax "Black Box" is garbage and the nastiest stuff I ever tried.

 

Good reading for us folks who can't seem to buy any color besides black. Looks like I need to order some Zaino's and/or Glare.
Merlin: Which would you recommend if buying only one? I want to use on my white Camaro RS as well. I see Zaino's has an Uultimate Protection Show Car Kit which also contains leather cleaner/conditioner. Thanks for all the good info. I need to go home and clean out all of the crap car cleaning products I have collected in all my experiments.

 

Sounds like you have a black and a white vehicle and you want to use only one product.

I'd at least suggest Zaino Z-2, ZFX and Z-6
Z-5 is for black and dark colors..You can layer Z-2 on top of Z-5
Z-5 is not as shiny as Z-2 and IMHO does not fill very well.

The Ultimate kit is a good selection of Zaino products
I'd use the leather products for my car not bike seat.

Why not get Z-2, ZFX, Z-6 and Glare Pro Polish to fill?

 

Been ride a few years. Had a few Black bikes even though I swore a few times I would never have another.
If you don't ride much there are a lot of products that will keep them look sharp.
If you ride the thing Black is a pain and no magic stuff in a bottle,can or tube is going to change that. Some may slow it down some may hide it while but Black is going to get you if you really ride the thing.