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Tallboy-
Do these work on tubes
The spray cans were originally designed for tubulars, which have a butyl or latex inner tube. Obviously they're agnostic about what's containing the tube. Some of them claim to be effective on tubeless too, but if your sealant hasn't worked I doubt whether a spray can will do any better
gbj_tester
Nothing is probably the most common choice. Punctures are not that common on main roads. I never had one in a TT.
But you risk a 10-mile walk of doom back to an HQ, hoping a returning marshall will take pity on you!