I would use a two part epoxy.
To put a window back on track in a 1996 Geo Metro, the door panel will have to be removed. Use a screwdriver to pry up the clips around the door panel. Then locate the window cable and rewind it. If the window is operated by a power switch, be careful not to pinch the fingers when rewinding the cable.
Use Silicone or some type of epoxy rated for metal, plastic, glass, etc. I would use an epoxy before i would silicone because it most likely wont last more than a couple years.
I have a 93 Jeep GC. You can put the window back on track but it will certainly come off again. You need a window regulator/actuator. Ive done a lot of research on the web and it seems that most jeeps are having the same issues with the windows. The part is pretty expensive. Someone told me you can use the rollers offf of a sliding screen door instead
If you have an electric window, you may want to go back to the dealership where you bought it as they would know the best way to deal with the motor, track , and what type of glass to use.
You can go to a window replacement place and they will glue it back on. Like a lebeau vitre d'auto. I hope this was helpful for your type of vehicle.
Epoxies are best for this kind of outdoor work.
You can try glue, but you're much better off using a special adhesive. Some are spray, some are painted on. Places such as autozone, advance auto parts, or napa should be able to give you a suggestion as per the specific type. There's many kinds, so make sure you get the right one. Worst case scenario if it's a plastic back window it may need to be sewn back together.
Use wood glue for wood to wood, to glue a cabinet back together you need to remove the old glue so that you have a clean wood to wood contact if this can't be done you can use epoxy glue, go to your local hardware store ask for help and tell them what you are working on and they will help on the type of glue you need.
Yes, gum is type of glue.
A reputable version of Super Glue would work. ( not the cheap stuff you get in 'Dollar stores' )
Use a dab of cooking oil and rub the glue off then clean the mirror with window cleaner to remove oil. No harm to the mirror, works on any type of glass.
Type of car would help. Some regulators bolt in, some are held in with rivots that must be drilled out. You should be able to take the regulator loose and then remove it from the window track. GM's at some point went to rivots, can't speak about others. There should be enough room in the door to slide the regulator back and forth and get the 2 guides out of the track on the bottom of the window.