Nanotechnology scratch proof coating for iPhone screens

I recently seen videos about this new nanotechnology coating that can be applied to devices such as the iPhone screen. This coating supposedly protects the iPhone from scratches and repels oils and water. These products are applied by rubbing a liquid onto the screen which supposedly will harden within a few days to create a coating that protects the screen but without using a screen protector so there are no bubbles etc. However, I could not find any reviews at all online for them even though they have been out for some time. The products are called Dynaflo Liquid-Armor and H7 Liquid Defender. The YouTube videos look legit but I don't know for sure if it works. Has anyone ever tested or bought any sort of nanotechnology coating? I did find services that coat your car or your driveway with this coating and it looks like its supposed to repel water and stains. It looks pretty neat to me. Before I buy it though I want to make sure it isn't too good to be true! I've been looking for alternatives to the invisibleSHIELD forever and if this is legit then I can finally go naked and not have to worry about screen protectors anymore. Thank you everyone!