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Fresh paint on fully cured plaster cracking

Postby CrackedPainter » Mon Apr 12, 2021 8:04 pm

Hello everyone!

I’m hoping the forum's expertise can help me resolve this. It starting to drive me nuts!

So, we’ve had an extension done. Plasterer came in. I left it a week, plaster turned a light colour and looked set (as per internet pics). I then applied x1 mist coat (80% paint 20% water) of white Matt. Left to dry then another coat of white Matt. Then 2 coats of the following;
Ceiling - white,
1 wall - dark green,
3 walls - light green.

The ceiling and dark green wall - fine, no problems. 2 of the light green walls have patches of cracking on them, the patches are in the inside of the window frame and in a corner exactly where the walls meet.

The ones in the frame appeared after the first coat so I scraped them back to the plaster or white coat then re-applied the coats is taken off. Then I put a 2nd coat on and now new cracks in the corner have appeared and the previous ones have come back. What am I doing wrong?!?
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