| Sealants
I picked up a split pin in gravel in my 500 mile-old rear Michelin Hi-Sport last Saturday. After being recovered to a local dealer he would not repair the puncture, saying that the angle of entry of the pin was not perpindicular to the tyre carcass and that the plug would not seal correctly. I suspect the real reason was that he had too much work on a Saturday afternoon to be bothered.
Does anyone have experience of using tyre sealants? I have been looking at a product called Ultraseal which claims to seal safely most punctures up to 6mm diameter.
I would be interested in any views on safety - most tyre fitters are anti (presumably they would prefer to fit a replacement tyre). Has anyone used it to repair a flat | 
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