Help me repair a tubular?

Beat me to it! ;-)

I have a tufo liquid sealant. Not used it yet but have used aerosol ones successfully.
(gas ones are harmful to the environment though so I swithed to tufo)
It's a natural latex which you sueeze into the valve and let roll down inside towards hole.
It seals when in contact with air. Supposed to be good.

so how come it doesn't go solid inside the tyre?? there's air in there?!?? ;)