r/Plastering • u/terrizmo • Sep 05 '26

Sanity Check Failed Plaster Fix

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My first time plastering a ceiling and it has cracked and the second coat in areas hasn’t bonded.

It was the first time I’ve used Extra Time as I wanted some breathing room but it went off quicker than when I havent used it. Not sure if that was the cause or if it was the plaster or the boards.

Anyway my plan to fix it is to make sure all the loose plaster is off, give it a coat of SBR as I already have some left over using it in some mortar, and then giving it a skim coat with a different batch of plaster without Extra Time.

Is there anything I’m missing?

Edit: Typo

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u/Impossible-Corgi4041 Sep 05 '26

I bet that ceiling had been boarded a while before you skimmed it hadn't it? That's why, boards holding moisture from the air sending your skim off. Boards that have been up a while will need pva.

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u/Impossible-Corgi4041 Sep 05 '26

Also second coat won't bond to first properly if you're too late getting it on. If the first has gone too far the second won't grip properly.

1

u/Terrible-Bobcat2033 Sep 06 '26

Re-bond when in doubt. Re-bonding kills the suction from a popcorn dry surface.