It reminds me of the Alec Guinness film "The Man in the White Suit." He invents a cloth that never gets dirty but then has the whole establishment and unions trying to bring him down because it will put so many people out of work.
Looking at the manufacturer's claims on liquid glass it potentially has hundreds of uses. If I had some the firsts things I would use it on would be:
Aquarium, obviously, including the inside of all the hoses and glass ware
Glasses and sunglasses
Car window screen
Toilet, anything that helps with that is a plus
Ipad, mobile phone
Carpet
Chairs
Bathroom tiles
Children
Husband
Car