HI - We own a 100+ year old house and have our steady fights with milk based paints - pretty much all paint removers fail (even peel away left a smeary suface - all others did not even get that far) and if you try to just paint over you often are able to just sc**** the paint of with the fingernail. we have used all kinds of different paint - the problem is in the rooms and on the outside of the house. Even proffesional painters did not get a better paint job done ----HELP ;-)