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I have just rolled a second coat of emulsion (Farrow & Ball, brand new tin) onto a bedroom wall and an hour later noticed that a sweep of the wall (a few inches wide) has hairline cracks. I’ve not been aware of this ‘sweep’ before so am almost certain that it appeared today. The first coat was applied a week ago, so the surface was dry; and I’ve no reason to believe the wall was dirty when I painted.

Can anyone suggest what might be causing this and what I should do?

There was no wallpaper paste residue on the wall before I started this job, but before the paint went on last week I did have to fill some hairline cracks in this (and other) areas with Polyfilla. The odd thing is that I didn’t notice the cracked paint after the first coat was rolled on; it seems to have appeared only today (after the second coat was applied).