Okay. So I am skim coating the walls of our new condo to get rid of old, rough texture. I don't know the technical term but I call it "detexturizing". The walls are right where they need to be, nice and smooth after 4 coats of drywall compound. My question has to do with corners. I am ready to start working on the corners. There is already existing metal corner beads that have also been mudded over. Do I buy new metal corner beads and apply them over the existing ones? How do I finish the corners properly?