I saw this stuff at a store the other day. After getting a flat on a bicycle, I went to get a patch kit and came across these bottles of greenish Slime that claims if you put it in a tire, you just never get flats. You can pull nails out, and they self-seal. They also had Slime branded bicycle inner tubes too, that I guess already have a coating of the stuff inside them, so they're supposedly flat-proof. It looks like they suggest adding about a half a pound of this **** to each tire on a bicycle, so I guess on a 29+ bike with 3" wide tires, it would take even more to work. I'm trying to weigh the pros and cons of using this stuff rather than just being prepared to fix a flat anywhere, anytime. What do you know about this stuff? Does it wind up ruining your best tire gauge eventually? Does it work?