The PitStop is what I was going to suggest. Another thing to try in cases like these is the Stan's liquid latex. It has worked the same for me than the Vittoria PitStop and it is much cheaper. The only issue with it now is that it seems there are 2 versions of the tires: one that you can take the valve off and the other you can't.
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Arguing with ignorant people is an exercise in futility. They will bring you down to their level and once there they will beat you with their overwhelming experience.