Question about DiamondProtect Nano liquid glass

Ah... Advertising says it all... but I can't find any test or proof... I only see and read claims. This could simply be a hardener that protects in the short term, or maybe even attacks my surface...
I think it's a simple feint, he just hopes to sell enough before the bubble bursts!!!!

I smeared the stuff (or something similar) on the windscreen. It's great how the water rolls off! Balls form immediately and they roll away quickly... until the first time you drive through fog or drizzle. A windscreen with millions of tiny water beads, which unfortunately don't roll off anymore, and then someone comes towards you with full lights. Pure cinema feeling - I mean, in the cinema in front of a bright white screen would have been less dazzling. I almost couldn't get the shit down. Well, you never stop learning. :-)

Advertising doesn't lie after all:

http://diamondprotect.de

OnePlus 3T picked up in the shop, incl. this seal, can only say TOP!!! I am very satisfied, no more foil necessary, I often have it in my pants with keys that could scratch the display.
Not a single scratch so far with the sealant, but I haven't tested it without the sealant :)

From my side, very recommendable.

Neither do I, but it really works!