There's also Shoe Goo, which is basically the same stuff, as is a brand called Goop. The nice thing is that it'll hold securely, but if you ever want to remove it, it'll come off without leaving a mark.

Most seats I've seen the bottom is made from a flexible engineering plastic. That stuff will resist nearly every type of adhesive out there, including superglues, and two part epoxies. Rubbery glues like E6000/Shoe Goo/Goop will hold that kind of plastic better than just about anything else.