I haven't really done a lot re exchanging scents as she is a foster, so is only here till we find her forever home - she originally was only supposed to be here for a couple of days, but the shelter now can't take her (I prefer oldies to be in a home environment anyway). I always isolate fosters for 2 weeks, just in case they start with cat flu or have fleas, but I did leave the door to her room slightly open a couple of times, which meant other cats came and investigated and got spat at. The main prob is I have never had as many cats as this for this length of time, my limit is normally 5, and I have 6 in at the mo, they have all been here varying lengths of time, so they are all at different stages (i.e. Tom has access to the whole house 24/7 and outdoor access, the lodgers have access to the whole house all eve and overnight, she has access to the whole house for a few hours each night). I am only trying her out with other cats as I know it will be easier to home her if she can go to a home with other cats, otherwise homing a 12 year old as an only cat wont be easy. The other problem I have is I only have 2 out of 6 that get on (they have lived together), Ginger stays out of the house to avoid people, Pebbles bats some of them (she will let tom on the bed, but if he gets too close she bats him, so he is now scared of her, despite her weighing 3.58kg and him 8.6kg!!), Tom loves females but they dont like him, so as a result he gets spat at and sits there looking at them!!