I filled drilled holes in a dry crumbly wall with bonding plaster & pushed wallplugs in. How long does the bondage plaster need to be left before screwing? I expect a day would do, there's not much plaster volume.
NT
"bondage plaster need to be left before screwing"
Did you moisten the hole with PVA before plugging?
Owain
I read that as did you moisten the hole with KY jelly first until I read I again!
I was thinking PVC more relevant to bondage, screwing moist holes and plugs...
no. I scraped out the debris & blew it out, and the plaster will have some dust bonding effect.
NT
Too bad you can't get rawlplastic any more...
I've still got some ;-)
It turns out 3 hours is enough - much less time than I've previously allowed.
NT
What usually happens if you don't moisten and seal with PVA is the existing dry plaster will immediately suck all the moisture from the new plaster leaving a weakened cracked structure in the infill material.
well, it worked fine. It's not a demanding application, It just needs enough cohesion to not migrate when compressed.
NT
What was the original asbestos based stuff called? Still remember mixing it in the palm, moistened with spit.
Rawlplastic
Rawlplugs into plaster a total waste of time. Needs to go into the brick behind. And if that has crumbled, a decent mortar.
I keep an out-of-date bag of Wickes fine surface filler for jobs like this but there is always plaster-of-paris !.
Best to paint the crumbly surround with some pva first.
In that case you need some evening primrose oil.
obviously they're going into the brick behind. Wake up. And no, there is no need for any mortar, the bonding plaster is doing a fine job.
NT
Depends how old the plaster is. I was using a bag last weekend which is well past its date, and it sets in about 20 mins - very handy for filling in plaster chases.
However, too far past the date, and it's already set in the bag. It may still be a powder, but not capable of setting much further, so the strength declines with age as well as setting faster.
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