.....I don't know about you but if I had a tyre let go on the motorway at 80mph, I'd be less than confident about the ability of a can of gunk to inflate it to a stage where it was safe to drive on.....
Believe me it lets go at anything above 'town' speeds, by the time you can get the car under control and safely brought to a halt (personal experience here,
) the tyre is going to be way past the point of reinflating with anything! Doesn't stop some of 'my' customers trying though,
, then coming back and complaining that the can of foam didn't miraculously glue all the shards of shredded rubber back together again,
I've never understood why car manufacturers think that some tyre sealer is enough to cover all emergencies. A straight-forward slow(ish) puncture maybe, but no use at all if you've just ripped out half the sidewall. I can live with a space-saver (just) but I'll never accept a 'no spare wheel supplied' situation with any car of mine. In a few cars, the new Mini for instance, fitted with run-flat tyres you don't even get the can of foam let alone any sort of spare wheel, although in said Mini they do give you a jack and a set of tools - bizarre,
. Most others supplying run-flats do, fortunately, acknowledge the limitations of these and give you at least a space-saver.