An existing stud partition has a large bit of plasterboard which needs
replacing. I've cut a new piece of board to fit the hole. Question -
do I cover the joins? Do I use jointing tape as for a new wall? The
issue is that the old boarding has been skimmed, so if I apply tape it
will create a raised area over the joint. Do I just have to live with
that; ie, and re-skim the whole wall so it has a thicker layer of
finishing plaster to 'bury' the proud tape? I've tried picking off
the old skim layer around the join without much success.