If Buspar has not worked then perhaps it is time to find the cat a good home where he can be the only cat. There is not a whole lot else you can do to stop the marking if the cat is feeling very insecure.

Is it at all possible to give him his own "space" where the other cats are not allowed to come into? That might be a workable solution.
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Smile, it will make them wonder what you are up to!

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