Bonding coat

[jacko555]

I've attached a pic of a hole from where a picture rail was removed. I have a few similar chunks from when windows got replaced etc. None much bigger than a side plate.

It's a 1920's ish house, original lathe and hair plaster ceilings etc. Assume lime plaster walls.

For this hole (and the others) is this an acceptable fix for a diy'er:

1) remove any loose plaster
2) apply bonding coat to bring close to level and let dry
3) apply toupret filler to level (toupret as I can sand if reqd)

Before applying the bonding coat, do I wet the bricks first? Is dilute pva required first? If so, so I let it go tacky first?

Please advise and many thanks

 

[sxturbo]

Really you need to use a breathable plaster

Something bloke this will be ideal


http://www.limeliteheritage.co.uk/case-studies/the-forgotten-solution-renovating-plaster/

 

[jacko555]

I'm pragmatic.

House has cavity wall / not solid brick. Bathroom was skimmed in gypsum plaster a decade ago, on top of the lime, with no visible issues.

These holes are upstairs and small (side plate) - the odd gypsum patch won't cause issue.

Plus I have a BQ handy for bonding and own toupret...

What do you suggest re: pva, or, shall.I just wet the brick first?

 

[sxturbo]

Wet the brick PVA then bond and fill

 

[jacko555]

Silly question but I've not used pva before.

Do I add a dilute mix of pva and water (70% water) and let it go tacky before applying the bonding?

Or do I let it dry?

 

[roughcaster]

Silly question but I've not used pva before.

Do I add a dilute mix of pva and water (70% water) and let it go tacky before applying the bonding?

Or do I let it dry?

Thin the pva down , let it go tacky, then plaster onto it., NEVER ever plaster onto dry pva.