I used Liquid Glass back in the 80's and early 90's. Stepped up to the newest and hottest waxes and sealants. Just this past year I got a can of Liquid Glass. Stuff works as well as any of the other high priced sealants that I used to use. I wax every six months. Liquid Glass still beads at the six month mark. Keeping it simple is my plan going forward.
Used it for years with great results. Stopped using it a couple years tried a number new products. Then went back to using it as my basecoat and then applying Collinite Liquid Insulator Wax #845 over top. Maybe not what most would do but it has been working well for me.
Good stuff but I always found it hard to work with until I used the pre-cleaner first.
This stuff does a great job of cleaning the surface which makes Liquid Glass easier to apply/remove, but I'm with others here, there are other products that are easier to work with for a lot less money.
Used to use Liquid Glass back in the day and always had good results with it, but as time went on I found something I liked better. Never will knock the product though. I remember as a kid my dad having a can in his garage.
I don't buy it but I use it on a family members black car. It doesn't take out little scratches but it seems very easy to put on and take off. Seems to come off even less smeary than some spray waxes that I've used. I always do two coats because it's so easy to do. If I was paying I would try something cheaper/newer.