You do all realise that most new cars come with a can of tyre weld, or similar, as a space saving method!?
All you have to do is connect it to a tyre and press, hey presto, tyre is good for a few miles again!!!
Saves weight and space, as mentioned, also easier than getting dirty and changing a trye in the dark or wet!
Just thought i'd mention it seeing as so many people have no clue
I agree that it's OK as a quick fix but the problem is that most people don't know that the tyre will be rendered totally useless by this foam so that's why the spare wheel is a far better option.
And what's more Ford don't charge you a penny extra for it!
BMW do and I suspect other manufacturers are the same but Ford give it to you for nothing--you've just got to make sure that you know before you place the order!!!