I used it to fix the warped edges of a plastic component. Part of a spinning plastic rotor. Similar to the ones you see in fish tanks. This one, was for drawing liquid from a tray into a tube. Known generally as the glass engraving kit. Anyways, I put the piece back into place into the motorized unit. And it worked.
It's use continued for more then five months.
A friend of the family, made boots out of cardboard with duct tape. To fasten to the feet of an Alf doll. I thought that was kinda neat when I was a kid.
Frankly, I think everyone should have duct tape. You never know when you'll need it.