I put it in every new set of tyres I get m8, it's used by the army on all their stuff so if it's upto millitary spec then it's more than plenty for us urban peeps too
Sweet thing is, once you buy one lot, you can take the bottle back to them, and get it refilled at a cheeper price to use on your next set of tyres!!!
I think they are up in brum somewhere???
Reason I looked into all this, is I used to have a 70 mile trip to and from work every day, and I put a brand new BT010 on the rear of my 400...
Bugger me 2 weeks later I got a screw of all things, right in the centre, I didn't even realise till about 3 miles out going round a roundabout it felt a big vaige in the rear end LOL
Anyway was hassle slowly riding the bike back to work, and then taking the rear wheel off at work to bring it back home (had to get a lift) then get it fixed, then take it back, and put it back on etc...
All that agro, could have been prevented by Ultraseal, so thats why I've used it now, touch wood, I've not got a puncture since, but it's the only stuff on the market that does a PERMANENT repair.
DynaMight true, I could make up some testicles to explain it, but to be honest, no idea m8, but I'd rather have a rear puncture than a front one any day of the week!!!
It does upto 2 PERMANENT repairs if it's in a safe area of the tyre...
People ask, well does it do the repair without you knowing, and then could you end up with more than 2 repairs, making the tyre illegal???
Way it repairs it is you get something stuck in the tyre, and then you might loose a bit of air etc, anyway it's when you pull the nail/screw/glass out, that the Ultraseal stuff is pulled out with it, and then auto plugs the hole!
So least that way you can keep a count of how many repairs it's done.
Anyway enough waffin, it's not the be all and end all but out of whats on offer to us to buy, its by far the best, and it will save you aload of hassle

(espically if your a long tripper like me!)