My tourer doesn't have a spare, it's got a compressor and is supposed to have a can of tyre repair instead (but that's missing). Are there any differences between these 'get me home' temporary repair cans? I've heard some gum up your tyre so much that it can't be repaired and some that are water soluble and don't knacker your tyre so can be repaired (if the hole's in the right place). Does anybody have any recomendations?