Because people have a need to glue things to other things
Glass to GlassFor the strongest, fastest, and most invisible bond we recommend:
Another fast alternative that will do the job, but not as strong, is
If the bond has to hold up to solvents use:
Whenever you are gluing glass you must consider the visibility of the adhesive. If the glass is translucent or transparent, you will want a glue that dries as clear as possible.
Before gluing any glass bond be sure that the glass is clean, free of any oil (even from your fingers) and dry.