OK, I did the first pass on the Altima and the Leon ...
Altima:light mettalic blue - had a couple of layers of BF pp
Leon - dark mettalic blue - had many BF PP layers and a couple of Blitz - looked really good but I was curious about Klasse and was also interested in a little longer durability.
The Altima was a breeze, AIO twice, looked really really clean, it had been clayed about 2 months ago when I got the BF.
Applied the SG and was easy to remove except the hood where I got a little rushed and applied a not so thin layer, used a damp MF towel and everything is well.
The paint in the car looks like it has a magnifying glass attached, I can see "all" the little metallic particles in the paint, color looks slightly lighter... very good reflections, smooth, and slippery.
Yesterday the Altima had a 3 hr. road trip with speeds over 80, a damp Mf towel easily cleaned the remainings of a few bugs that hit the car.
Leon: 2 days ago I tried in a rush to apply AIO to the hood and it just resulted in a bunch of marring...
Today I skipped my bike ride and started early so I could beat the heat, washed the car, and then AIO with a damp MF applicatior, long smooth strokes with moderate pressure making sure I had an even coat of AIO, did the whole car twice, rinsing the aplicatior when it looked dirty. Again the paint looked incredibly clean as it did with the Altima. SG went on with a foam applicator, movements were rather quicky so the apllicatior doesn't get dry and I can get a thin and even layer. (It was already near 90F low humidity). Much easier to see what I'm doing with the dark color. It took over 20 minutes to apply the SG so I started buffing right after this with a Mf towel.
I have the same magnifying glass impression and slightly lighter color, very nice!
Will apply 2nd layer of SG as time permits ... probably until next weekend ...