I'm personally not a fan of the stuff for the same reasons your tyre fitters suggested.
Quote:
Originally Posted by
Richlybow
I had a rear wheel puncture last year (masonry nail) and the tyre went down like an Italian centre forward even though sealant was installed (notably at 70mph on the motorway)
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Sealant doesn't really help much in this sort of situation anyway as the tyre will still go flat, generally the sealant requires the tyre to be re-inflated to actually do any sealing job.
I do use it in my wheelbarrow tyre though!