I put sealant in mine, but the winter miles are killing mine and i had a slow puncture last night. Thank god the sealant worked but it still a concern now that kojak are just useless for my 17km commute.
Put a Kojak on, last week, as an emergency tyre to get me through till when the Conti's come out. Wondered how long it would be until the puncture fairy arrived. Turned out it was about 50 miles in.
1st commute after fitting Kojaks got a puncture!