Our ceiling was plastered over to cover the artex last year but a long hair thin crack has appeared and I would like to fix it myself. Apparently the plasterer never re-screwed the ceiling boards to the joists as he promised. So i was thinking if I screw them now nicely and use decorators caulk to fill up the crack and to cover the screws that should prevent more cracks...or should it be replastered completely?Furhtermore someone told me that it should be covered with plaster boards all over again. What is the right thing to do?[/b]