Liquid Glass had to change their name to Liquid First Class when they lost a lawsuit claiming that there was no actual Glass in their formulation :-)
They were the first to use lighter fluid on fire to indicate how tough it was, and a can sliding down off the hood to show how slick. They used to go to a junk yard and find a distressed hood and demonstrate how even a "Junkyard car" can shine again. Marketing tricks still used today to sell wax and polish.
The amazing thing about Liquid First Class is how much better even their great shine can get by applying additional coats.