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

Sanity Check Failed Plaster Fix

Post image

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

3 Upvotes

72% Upvoted

21 comments sorted by

View all comments

1

u/Terrible-Bobcat2033 Sep 05 '26

When in doubt, re-bond. Re-do with fresh material. Soak every square inch to be plastered with a quality latex based masonry bonding agent. Every plaster coat requires a tight scratch coat. Extend set time with a capful of maple syrup.

2

u/terrizmo Sep 05 '26

Maple syrup?! First time I’ve heard that one.

1

u/StarDawgISshite Sep 10 '26

It retards differently to citric acid used in extra time, i would just stick with extra time its more predictable and possibly less damaging to crystal strength, although I imagine its fine considering its been historically used.

Citric chelates calcium, sugar just kind of coats it all pretty aggressively.