Thanks
Well I would hesitate to put Souveran on top of the Zaino. The Zaino was meant to be used as a system in which the toppers of the Zaino would be Z-2/Z-5 or Z-3 for non-clearcoated surfaces. The Souveran might possibly break down the Zaino coats when it evaporates from the surface. Sure you would get a real slick and more 3-D surface but at a cost. You will not be able to add more Zaino coats unless you wash the car with Dawn or let the Souveran wear off.
I like the easy factor of Zaino. Sure it might take a little longer to apply the first time (mostly the dawn wash) but a Z7 wash and Z6 QD is all that is needed to take care of the finish. A quick coat of Z-2 or Z-5 might be added every now and then, but not quite as often as Souveran.
If the car is a garage queen and black, I would recommend Glaze + Souveran.
The ML is garaged at night, it is outside roughly 10-12 hours a day, 5 times a week. The owner doesn't have enough time to put on a coat of wax every 2 months. He will only get to wash the car once every 4-6 and possibly Z-6 it (I gave him my bottle of Z-6 (95% full) and half of my bottle of Z-7 (poured my half into a water bottle labled Z-7) I guess I have to get another bottle of Z-6 from my dist.) The Z-7 wash and Z-6 should take around 30-40 minutes for normal people, not a few hours like some...but to each their own.
So Pete in short, I think the disadvatages of Souveran on top of Zaino make the Souveran almost pointless on a Zaino'd car.
Thats why I have Klasse, Zaino, samples of Blackfire and Platinum, and a whole assortment of waxes (Souveran, Blitz, #26, Gold Class, and if I lose all my good waxes, I still have my first can of Armour All Car wax (pretty decent wax)
Jason