We used butyl (sounds similar to "view tool") tape to install the glass like the factory did on first- and second-gen Camaros. It is essentially a long roll of rope-like, round tar (aka ribbon seal or windshield sealer). It's very sticky and pliable, especially when it's warm. The factory used butyl. If the butyl is warm it will be ultra-sticky, so if it's cooler it will be much easier to work with. It takes a light touch to work with so it doesn't stick to your hands. Even though it can get messy, it sticks to gloves more than skin so we use gloves to clean up, but not to install.