In fact, there is not much to it. If you built the plaster ceiling yourself then repairing it is done a quite similar way. You will use the same materials and the same technique to cover the crack in the ceiling and that is all. If you did not do the ceiling yourself at first place than you have a bit more to do as this task might be a bit harder for you as you do not have the necessary experience. Thus, it is advisable for you to go to your nearest hardware store and ask their help about which kind of materials you should use and the staff there can also give you some advise of how exactly you should use it.  

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