What could these raised wrinkles in my plaster be? via /r/DIY

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What could these raised wrinkles in my plaster be?

Hello!

Me and my partner had our walls skimmed recently by a professional and we're doing the decorating ourselves. I'm painting today and noticed these raised patterns. They aren't cracks. They're small, the lines are about a 0.5cm in width. This is what they look like after the roller has gone over them once. Unfortunately there aren't any unpainted examples but before the paint went over they were whiter than the surrounding plaster.

What could it be? I haven't found any solid answers online.

Wrinkles in plaster https://imgur.com/gallery/JqGmEkn

Thanks!

Submitted May 03, 2021 at 01:41PM by VDB_12
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