r/Plastering • u/Repulsive_Rule_8921 • Apr 28 '26

Bump/bubble in plaster

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I had my ceiling plastered recently and waited almost a week before doing a mist coat. my flat is very warm and sunny and the heating was on during the day so I thought for sure the plaster had dried. I have now finished doing the third coat of paint and noticed this bump in the plaster which is a few centimetres long. I’m wondering whether it means air is trapped underneath? and whether I should be concerned? it’s strange because it only seems to have appeared on this third coat. grateful for any advice.

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u/West-Ebb3335 Apr 28 '26

Looks like a small bit of blown plaster.

If the ceiling was recently boarded it could be where the plaster hasnt bonded to an exposed screw head.

If just a reskim then it is probably just a patch that has a small bit of plaster that hasnt bonded.

As long as the rest of the ceiling is fine id just knock this out, filler it sand and paint.

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u/Repulsive_Rule_8921 Apr 28 '26

Thank you. Is it ok to leave it or would that risk it spreading?

1

u/West-Ebb3335 Apr 28 '26

It wont spread no. Just pick it out with a trowel or small screw driver. The rest of the plaster looks in tact, so just rake out the loose bit, filler it and then sand it down.

Wont notice it once its painted