I wish I had advice - but I don't and my Sid is like your Ripley - new furniture or other situations just seem to earn a spraying from him. I now also am running a couple of full time Feliway defusers (dang - those things are spendy) in an effor to calm him down.

So what does he do? Last weekend - out in the garage he sprayed my husbands tool cabinet. He's also now sneaky enough to do this when we're not looking. It is so frustrating at times.