A liquid screen protector and a liquid glass are different products with different features. A tempered glass can protect the surface of your screen from scratches and can be replaced if its’ damaged. It does at some thickness to the screen and it may not be compatible with all cases. It may also peel off and air bubbles may show up on your screen. Especially with curved edged screens, it’s a common issue that tempered glass may peel off easily. Finally, installation of tempered glass may be tricky sometimes, Liquid glass on the other hand, is easier to apply as it would not cause air bubbles and would not peel off. It bonds to the screen, makes it harder and stronger which means higher scratch and impact resistance. It also provides higher touch sensitivity as well as resisting the fingerprints and smudges due to it’s oleophobic nature. It’s very common that consumers use both products together as they complement each other. A liquid screen protector for higher impact resistance and a tempered glass to add an additional layer of protection.