My son lives in the midwestern US and we have attended their parade of homes. many homes (especially kitchen and family rooms) have a wall treatment referred to as a "knock down" finish. this is an interior textured coating system providing a rugged durable finish applied by spraying onto drywall, plaster, wood etc. I have contacted a few plaster contractors in the area and no one seems to be familiar with this. Can you help me to contact someone who is familar with this?