Slime and it's derivatives go in before to prevent leakage as punctures occur. There's also sealant aerosol solutions which are used after a puncture, and these are intended to seal and inflate at the same time. The latter were designed for tubeless car tyres and have limited success with tubes.
Frankly none of either has ever worked for me, and this has been the majority view of those posting in the forum. The trouble is that when Slime doesn't work, as often happens, it makes a sticky mess which prevents the puncture being repaired with a patch on the spot.
The best and most reliable solution is to do a practice puncture repair if necessary on a rear wheel, right through to putting a patch on the non-existent puncture, and then have the confidence to repair them as they occur. The other sensible strategy is to use puncture resistant tyres.
An alternative approach with punctures for anyone with basic skills is to swap the tube on the road, as it's a quick and clean solution. The punctured tube can then be repaired at home.
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Frankly none of either has ever worked for me, and this has been the majority view of those posting in the forum. The trouble is that when Slime doesn't work, as often happens, it makes a sticky mess which prevents the puncture being repaired with a patch on the spot.
The best and most reliable solution is to do a practice puncture repair if necessary on a rear wheel, right through to putting a patch on the non-existent puncture, and then have the confidence to repair them as they occur. The other sensible strategy is to use puncture resistant tyres.
An alternative approach with punctures for anyone with basic skills is to swap the tube on the road, as it's a quick and clean solution. The punctured tube can then be repaired at home.
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