Thanks Bob and Ron, to answer one question, no it doesn't bother me nearly as much as it bothers my wife. to answer another, no it is not on the cieling only the walls, the ceiling has some custom plaster moulding detail that wasn't messed with. The knock down has been painted and i doubt that the 6" knife will do a thing. I know that if i have to i can just fill and skim coat to get it smooth again, but that is the least desirable solution. Tell me if I'm crazy but, could i scor the surface as if i were removing wall paper, mist the surface with water, and then scrape without endangering the integrity of the original plaster?