So I've purchased a house and one of the rooms had a dado rail on, I've pulled it off and the plaster isn't damaged however it was recessed due to the layers of paint over the years above and below it. Anyway I sanded it and pollyfilled it, I've painted the wall with 3 coats of matte only once white and you can still see where the dado rail was it's like a magnolia tinge to it. What else can I do to make it adhere to the paint better as it's ******* me off 
