Does Slime work at preventing punctures? Maybe so, if the definition of ‘works’ is covering your inner tube in green gloop. It’s hard to say if the slime had held back any previous punctures but this awful mess came about from a small hole caused by a thorn. I removed the tyre and that’s what confronted me. When I contacted Slime I wasn’t much impressed by their customer service either. They did offer to send me out some more Slime, but as you can imagine I wasn’t too keen on using it again.