Like Barry said, get a bottle of pump hairspray, the cheapest stuff you can find. It works great, and dries fairly fast. It burns off clean, and if by chance you have glued something on to your glass with it, and it dries and you want to move/remove the piece just put more hairspray on it and it will loosen the piece.
I put my hairspray in an empty Visine bottle to make application easier. Some people use a dropper, or you can buy little plastic squeeze bottles.