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There are a few different answers and none of them is what you will want to hear!
rake it out to a v shape and fill it with filler then prime the filler with gardz and paint the whole ceiling is the basic method. You can use a very fine scrim tape over the filled joint but then you need to fill a larger area and feather the edges of the filler which is tough to hide in some cases.
For some people it's enough to use this kind of tape and paint over it.
https://www.decoratingcentreonline.co.uk/tesa-crack-cover-tape-2-5225.html?
Airhead
@meneer
How do I fix hairline cracks (thick hairs) in the ceiling on plasterboard joints in a newish house? It’s a conversion of an old building that was (and probably still is) moving. The paint is Dulux Trade matt white. Is there a smart filler I can use, or something else I can do to reduce chances of it cracking again?
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