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Well, of course putting sealant into a tyre won't, as such, prevent punctures, but will stop the tyre going down until the puncturing object can be removed and the tyre repaired, and the tyre should be repaired at the earliest opportunity. Now, with a car tyre, it may not be noticed for a while that there is a puncturing object stuck in it! This isn't the case with bicycle tyres! I was saved from certain death by having 'OKO Tyre Sealant' in my bicycle tyres many years ago. OKO is (or was) a green snot-like substance which contains tiny fibres which will block small punctures. Riding home from work downhill on a Winter evening, nose-to-tail cars scraping past on my right and lamposts only a foot to my left (they've now been moved back as planners now think about safety) there was a bang as my back tyre went over something sharp. Expecting the bicycle to start 'fishtailing' and knowing that braking would just make things worse, I desperately looked for somewhere to crash-land, but my only choice was to hit a lampost or a car! But..,. nothing happened! The tyre didn't deflate! At the bottom of the hill I stopped and checked the tyre. A curved piece of glass from the top of a bottle had gone in with two prongs like a staple. If I had removed the glass, the tyre would have gone down; the sealant isn't that good, so I Ieft the glass in and continued the last eight miles home, and it got me home, where I could repair the inner-tube in comfort. So there is a use for having sealant permanently in a tyre, but perhaps just bicycle tyres and maybe not car tyres.
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