I have only had sidewall issues on tires, which apparantly renders them irreperable and the cans of stuff are no good for.
Funnily enough the people I know that always have flats are those that get the cheapest tires possible, and run them down to the point where they fail a wof for no tread on a tire that is horribly gone hard and well past its useful life. And they still manage to get them repaired when any decent place should tell them its had it.
