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@ChrisNW
A colleague of mine has used them, bike in use every day.
He thinks they do actually work, but only for so long before the slime stuff inside turns to one big lump.
I helped him set up his rear brake and when spinning the wheel the whole thing was way out of balance because of the slowly solidifying slime in one part of the tube.
He's given up on slime now because it clogged the valve too so he had to buy new tubes when fixing a puncture.
FWIW, i've used slime strips for about a year and they have made a BIG difference to me. I do still get punctures but not nearly as often as before. When I do check the tyres or have to fix a puncture like I did a few nights ago, I always find several shards of glass, thorns and the occasional bit of metal embedded in the tyre that hasn't punctured the slime strip.
Downside, they're a bitch to get straight in the tyre - they always seem to snake round to the sidewall when you fit them, and they do add a little spinning weight to the wheel.