I've tried them both. The differences aren't dramatic but there are differences. I think klasse "glows" more than UPP but UPP is slick as snot and relatively easier to apply/remove because it's thicker. It sorta smells like red vines. Most users say that UPP makes the paint deeper but I can't really tell. Maybe after a few layers. It's a good product but if you're mainly looking for durability, klasse outlasts it. you can't lose with either product.
I would suggest doing a search on UPP. Lots of us have been using it for quite some time. I use it all the time except for winter when I use SG. 3 layers of UPP looks just like 5 layers of SG with a coat of P21S on top. The durability isn't at what SG is, but UPP will still last you 3 or 4 months if you choose to wait for it to wear off. Most of us don't know anything about durability because we never go 3 or 4 months without waxing our car.
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