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Jon.
Hah yeah I wondered if that was possible.
To get mine to seal properly I put a proper dosage of sealant in it, pumped it up to 40psi then hung it off the work stand with the puncture at the bottom. If yours is still on the rim and it was a pinch flat, this might be tricky as the cut tends to be on the side of the tube.
On the face of it that sorted it, but I doubt I'd race it again. If I schlepped all the way to a race only to DNF because the seal went I'd be pretty pissed.
As the tub was off the rim in hindsight I should have tried a patch repair.