I didn't think about the o-ring use. Possibly also for the o-ring in a fire piston.

Iron Raven,
Do you think it would work as a substitute for teflon tape too?
I am going to try it and see if it does.
Like you said, at a hundred yards for $1.99 it is worth experimenting with.

Used it last summer, for a kid at summer camp, by attaching one end to the screw off cap of a water bottle and the other end to the neck of the bottle, like a chain on a canteen lid. Worked like a charm the whole week.

Buttons never come off after they're sewed back on with floss.

Wound around a small rock gathered into a couple of corners of a bandana, space blanket, or lightweight tarp it becomes a makeshift fastener.

Given a choice, I'll use the right tool- teflon tape is my friend.

If I have no other choice than to try dental floss and hope it makes a good seal... Sure. *shrugs* I don't have anything that I would normally tape that isn't in use, so I'm not going to try. But if it is the devil or the deep blue sea, I'll try anything.

Yeah, I guess that would be asking a bit too much of floss to expect it to work as T-tape...
Cjoi is right about the buttons never coming off though.

Swimsuit?