I got a flat tire on my bicycle and didn't have any spare tubes or bicycle tube patch kits, so I decided to give the field repair kit a try. It held for about 40 min on a road tube at 60-70 psi, then began to leak. It would probably hold longer at lower pressure but isn't a good permanent fix. If it's all you have, it might get you home though! It also probably would work better on a lower pressure tube, like a mountain bike or gravel bike, but I have not tried this.
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