When I had my 4-5yo cats as kittens I tried to keep them indoors for the first 6 months or so as I live beside a main road and had lost 2 previously. It didn't work and I let them out so they now come and go but I always have them in at dusk and shut the door til morning.
However, while they were indoors kittens they started using doorposts as scratching posts and areas of wallpaper near corners aswell - I've got them off the walls since then I think, and sacrificed one old door as a scratcher, but no matter what I try I can't stop them scratching on the doorpost of my bedroom in the morning particularly when they want breakfast/out.. I believe there is a chemical in their scratchings that brings them back to it no matter what I shout or how many times at what volume..
I am wanting to sand and revarnish the doorposts and eventually risk repapering the walls - is there anything I can put on the areas meantime to break the habit before I put time and money into redecorating? Or would varnish be enough to hide the scent and stop them attacking it? Or is it way too late - the 2 older cats are nearly 5 and the younger one is over 2 and adds a vocally insistent alarm call to their scratching noises..