Last season I cut my Flexus the first race of the year, about a 2cm cut, the Tufo sealant held it all year but this year it just wouldn't seal, I tried this tire plug for mtb's, with two plugs it has sealed and I have ridden 3 races on it without sealant, saved me buying another 100.00 tire.
and a little video action from last year, I was filming two cameras
http://www.youtube.com/watch?v=MncA4nwg3uA&fmt=18
Tufo Flexus tire repair
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Send it to this guy: http://www.tirealert.com/
you can't because tufos are vulcanized.