The video makes it look like amazing stuff. Unfortunately, there are some drawbacks that you can discover on the manufacturer's website that they don't show in the video. On to the buzzkill…
According to the manufacturer's web page, you can't get it in clear, only translucent white and some custom colors, so it's not as substitute for Rain-X on your windshield. The coating produces a matte finish, not gloss or semi-gloss— kind of like coating the surface with a light dusting of chalk— so not too useful where appearance matters. Don't apply it to your automobile or motorhome, and don't even think of putting it on an Airstream trailer! Maybe on your shower walls to make cleanup easy…
It's a two-coat system, and you have to use both coats for it to work, because the top coat and bottom coat are different formulas. Bottom coat costs $60 per quart, top coat costs $95 per quart.
Only applicable by spraying, and the material safety data sheets require that you wear a respirator to apply it. Unless you're a spray-painter, sandblaster, or other profession that requires you to wear a respirator already, that's another large expense. Respirators require fit tests as per OSHA regulations in 29 CFR 1910.134, so you can't just buy one over the Internet, put it on, and get to work. Maybe if you have SCUBA as a hobby, and don't mind breathing from an air tank while spraying, you could avoid the need for a respirator…
Engineering: Finding complex solutions to simple problems you didn't even know you had.