Straight line cracks in paint - is it a problem with underlying plaster

RMacD said:

Hello, absolute novice here. The paint in my bathroom has cracked all around the room in perfect straight lines (see first 2 photos). When I’ve chipped off the loose paint and sanded it back there seems to be a paler line of plaster underneath where the crack was (see last 2 photos). What’s going on here? Will it come back if I repaint? Many thanks for your help!

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RMacD said:

Hello, absolute novice here. The paint in my bathroom has cracked all around the room in perfect straight lines (see first 2 photos). When I’ve chipped off the loose paint and sanded it back there seems to be a paler line of plaster underneath where the crack was (see last 2 photos). What’s going on here? Will it come back if I repaint? Many thanks for your help!

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essexandy said:

Yes.
Paint isn't very good at curing structural cracks.
Nor is plaster.

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Monkey Boy said:

Foam is @ChrispyUK

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