Adding some cement to Bonding Coat plaster gives an accelerated set.
Does anyone know:
What are the ideal proportions?
What effect does adding the cement have? - is there an adverse effect, make the coat more prone to crack, or what?
TIA
Adding cement to plaster Bonding Coat
Jan 06, 2005
2 Replies
So does using an old bag of bonding coat. It's not like it takes a long time to set anyway.
On a plastering course, we added cement to finish coat to make it a one coat plaster for patching a small area. I've never actually done it in real life since then though. It was a relatively small amount of cement verses the amount of plaster, but no one was using accurate measures.
Don't know. But the cement based plaster I sometimes use in fireplaces specifically mentions to avoid any contact with gypsum plasters so presumably there's some incompatibility there.
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