Puncturesafe rk
Know your enemy if considering this stuff. It will seal round the object that made the hole. The nail can then work open so tyre goes down, runs hotter, gets a hole over the sealants limit etc. The gloop then prevents the adhesive with string repairs working. Tyre fitters hate it, so no way will you convince one to wash the stuff out and fit an internal plug, it's a new tyre.
I have used it on bikes so small or short of space that even a string repair kit was a pita to carry. It works within the limits described. With the wee though it is so easy to carry an expanding mushroom kit (a near permanent repair) I can't see why I would revert to a pretty limited solution.
I you do have a flat that's to bad for a plug, can't get tyres and end up with a tube in a TL tyre, then I'd fill it with ultra seal as the only roadside solution. ( This is another trick of the Bavarian B*****ds, f650's have TL tyres on spoked rims. Can't change a tube without a breaker, can't plug from the outside)
Andy