I've been a die hard Klasse user for years. I usually follow up after about a dozen coats of SG (over 12 days) and use S100 Carnauaba.
S100 lasts a couple weeks a little longer if I use Sonus Carnauba Spritz which I usually use after the weekly wash. I'll reapply the Carnauba after every two or three car washes.
For a really really long lasting shine I actually recommend the Meguiars NXT wax.
I use it on my wheels and it lasts twice as long (at least) as my Klasse All in One applications. Don't know if I can layer NXT over Klasse SG. I'll have to try that.
p.s.
Try Klasse VLRP on your interior. Its excellent on black plastic.
1Z for your dash and tires. makes stuff look new but not shiny
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