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@Howard
Can't get out with Andy P tomorrow, so took the crosser down to Richmond Park this evening. Nice evening, but horrendous traffic on the way down.
Running the tubeless wheelset. Dropped the tyre pressures to about 20psi at the Park and all was going well. Nice and floaty, plenty of grip. Bike felt great. Did some reps of my favorite hill before I managed to score a sidewall puncture which sealant didn't immediately fix. Bugger.
Popped some air in and limped up and over the hill towards civilization before flatting completely. The misery of popping the tyre off and getting a tube in was equal to that of walking to Puntney tube in my mind at this point.
Decided to put my faith in Stans - pumped some more air in and found the gash - it was big enough to hear the air escaping clearly. Positioned the wheel with the gash at the bottom then tipped the bike up on its side so as to let the sealant pool directly over the gash. A thin jet of sealant shot out momentarily then a blob of sealant formed a spot where the gash was. All was silent. Put more air in then rode homewards. Had to top up the air at Putney but by the time I got back to Paddington the tyre was holding pressure nicely.
/csb etc.