Impressive.. but can you imagine the mess you would have every time you needed to change a tyre....

I used a can or tyre weld on the wifes car once. Really good stuff, but it does make a real mess of the wheel and it took the guy 5 mintues to clean it off!

I filled my bike inner tubes with a very early tyre sealant called OKO in the early 80's to combat the hawthorn hedge down our road. It didn't work very well and after the bike had been stood for a few hours it pooled at the lowest point which made for a rather odd gyroscopic effect when you set off again.

Never bothered since, but this stuff looks pretty darn good to me!