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  • Issue is this has appeared on the kitchen ceiling:

    Directly above that is the far side of the bath

    Bathroom was done about 5 years ago (as was the kitchen ceiling painting).

    Thinking/hoping it is the sealant as it doesn't look great at spots (although can't see any obvious lifting):

    Also, there is no easy access to under the bath so sealant is first easy thing to do. Not really sure the best way to see if that has/hasn't worked though (other than waiting for the patch to get bigger).

    No deep baths so can rule out the overflow at least.

  • Have a look at the grout between the tiles.
    Cementitious grouts always shrink, might be a hairline gap between the grout and a tile.

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