Thanks for your replies.Due to time constraints,and the looming spectre of being stranded mid-Alp/autoroute (or worse...) while the Ultraseal languishes next to my microwave,I decided to install it this evening.Easy enuff to do;I spun the wheels by hand before riding.AND WHAT AN IMPROVEMENT!!! The front wheel felt "planted" and the previously twitchy at low speed handling has taughtened considerably.When I test rode this bike (`96 1100GS,secondhand) it felt odd at the front end compared to my other 1100GS.It wasn`t quite "headshake",nor a shimmy,but seemed like an out of true/out of balance wheel or tyre (it had brand new Tourances on).The dealer checked it out and said the suspension settings were all to cock;but it still felt a bit odd to me especially at motorway speed,and I would sometimes be found sighting my front tyre at 80mph looking for "skip" or runout.
Well,people,that feeling has TOTALLY gone now! I did a,erm, high speed check,and the bike is SMOOTH and the handling perfect.
So I`m more than happy with Ultraseal,regardless of punctures!!
P.S. I think I heard a rumble a while ago about a batch of dodgy Tourances,does anyone know more? My experience seems to be that of a tyre with internal impurities ("sink holes" or bumps) now "filled in" or smoothed over by the Ultraseal..........