Originally Posted by mikeyis4dcats.
you mean the paper is torn?
If so, you need to carefully and cleanly cut out that area of paper with a utility knife so that only the damage layers of the brown paper are removed. You want to end up with a clean, smooth brown surface that looks like toilet paper roll. Then you DO need to seal it with an oil base primer such as Kilz.
Yes, this is my problem. I cut out the paper that is torn, but I can't get it much smoother without taking off more paper. I'm using 220 grit. Do I need finer grit? Wet sand it?