just an idea - what if you keep him in a cage/carrier and let him out in the quarantine room and if/when he sprays put him back in cage/carrier. After a few times he may get the idea that it is not allowed to spray. So far being put in the cariier is the only thing that is stopping my Meka from misbehaving. I put her in for about 30 minutes to an hour and she meows the whole time but it seems to be working. Just an idea. You are so sweet to want to help him!!! Since some things are meant to be maybe he will stop with a little training. I got my Meka from the Animal COntrol and her misbehaving and biting and scratching is proabaly what landed her there - or someoe let her out to fend on her own because of the bad behavior. So far if has been since Oct. but she is getting better slowly but surely!!! Debbie