It may be a case of redoing the fine cracks once more now the plaster sheets have settled. (Try shining a torch along a plaster wall to see how (un)flat they are.) If the 2 edges of adjoining plaster sheets are attached closely where there is timber above the join, the tape shouldn't be needed. The thing with ceilings is that bright light often shines across them, so any variations in thickness looks worse than it does on a wall, where the light usually arrives from many angles. This could be blended in by making it wider, but it seems like it would add more problems than it solves. Then he would have to add a coating over the tape to hide those tape edges, which would result in a mound on your flat ceiling. Make sure the patched area flows gently and does is not create a hump in the ceiling. I would imagine that putting tape over the crack would then introduce 2 more fine lines at each side of the tape that would need to be covered. Apply plaster to flush up the patch to the edges of the original ceiling. These t-braces will hold the drywall to the ceiling as the adhesive cures. To stick the drywall to the joists, you’ll need to use specialized drywall adhesive and t-braces to keep it in place. Then fill that crack and sand it flat when dry. Once the drywall is removed, sand the edges of the drywall so that they are clean and straight. Then it has depth and enough surface area for the filler to properly adhere to. The best way I have found is to run the sharp corner of a scraper along the crack to make it a V shaped crack. Use a utility knife to cut away the loose pieces of plasterboard until the hole is clear. I have found that hairline cracks aren't possible to fill because not enough filler can get in, so you end up with a super thin coating over the top that falls off like dust when dry. You may use a sanding pole for easier use.
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