I have just recently had my Bathroom refurbished and as part of this I decided to paint the whole bathroom, including new ceiling. All plaster (Joints Taped) and new plasterboard I have sealed with Zinsser. (one coat) and painted the whole bathroom with Zinsser Perma White, Matt. I have went around the edges with a small brush and filled the rest with a roller. (3 coats) I now have a prominent line around the edge above the tiling ,as per pics. The line is seen on the old and new plasterboard. I have no idea what this is and how I fix it, when the spot lights are on, this looks terrible. The line is not raised and feels smooth, I tried adding more paint to a small section of the edging last night, but this did not fix it.
