It is upstairs. And ceiling below is ok. But some of the mdf sheets do have a sag. Will adjust the layout of the room in due course, so may have to replace the walls.when I do the floor
CT1
It's excellent for covering cracks where wall meets ceiling. It's white and can be overpainted but I would leave it for a month or so before you paint it or seal it with a shellac sealer otherwise it tends to slightly discolour paint after six months.
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