Originally Posted by
elcruxio
The thing about sealant is that while it's great and does prevent flats to an extent, it's not bulletproof. You do sometimes flat with sealant, which is why many people riding tubeless carry a spare tube in case their sealant and/or plug fails them. So if you do flat you just put a tube in and go on riding.
Now you tell me! Just converted my new-to-me Shiv to tubeless and had a puncture today the sealant wouldn't plug. Nor would the plug kit plug. Had to use my "phone a friend" option. Walked two miles before he picked me up, the whole time thinking "I probably should carry a spare tube just for **** like this."