Widshield\backlight installation

I did my own windshield a few years ago. I went to the glass shop and they gave me two different sealers. I don't rember what the sealers were, but one type was used to seal the gasket to the body and the other sealed the glass into the gasket. And it leaked afterwards. I am planning to reinstall another windshield in the duster I am working on now. This time I will have the gasket cleaned and ready, as well the glass cleaned and ready. I will call a friend who works in a glass shop to come over and help me install it.