What's the correct ratio for sealing old Plaster with PVA?

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midiplaster

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Hi,

What ratio of water should I be adding to PVA when I want to seal a wall that's already been plastered?

I have read 3:1 or 4:1.

I've even seen 5:1 but surely that would be too thin?

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And I take it that the correct procedure is :

1. Roll on the mixture and allow the wall to dry.
2. Roll on another coat prior to applying your first coat of skim.

Thanks
 
Good question, interested to see the responses
i say mix water into the pva stir until it's not thick/glue like/lumpy
 
It's a bit like what my tutors tell me. 2mm first, 1mm second skim coat.

But I've seen some so called experts stating 4mm first!!
 
You just want your pva milky, give it a coat let it dry then give it another coat a bit thicker :RpS_thumbup:


So your reskimming a skimmed wall :RpS_unsure:
you had the chancers in or are you the chancer? Lol :huh:
 
Start off with 5/1 coat let it dry then a 3/1 coat, skim while tacky. No one does a 4mm coat unless its half bonding, thickness of skim depends on background, normally 3mm overall thickness is plenty but some do it thinner
 
flynnyman said:
Said it's been skimmed but the title says old hmmmmmm
Click to expand...

midiplaster said:
Hi,


What ratio of water should I be adding to PVA when I want to seal a wall that's already been plastered?


I have read 3:1 or 4:1.


I've even seen 5:1 but surely that would be too thin?


-----------------------------------------------------------


And I take it that the correct procedure is :


1. Roll on the mixture and allow the wall to dry.
2. Roll on another coat prior to applying your first coat of skim.


Thanks
Click to expand...

:RpS_unsure:
 
This guy sounds too technical to be a spread?? And what the hell is a "correct procedure" ?? :RpS_laugh:
 
PVA is yesterdays chip paper.......................IMO or BMO is this years must have.......................:RpS_thumbsup:
 
The wall has been skimmed before. Skimmed with something called Plaster.

So effectively, it's old Plaster.

I tried applying a coat to one section of the room, but the suction drained the life out of the Plaster within minutes.

So, I must have got my ratio of water to pva wrong.

I'm looking for an educated answer.

Thanks
 
midiplaster said:
The wall has been skimmed before. Skimmed with something called Plaster.

So effectively, it's old Plaster.

I tried applying a coat to one section of the room, but the suction drained the life out of the Plaster within minutes.

So, I must have got my ratio of water to pva wrong.

I'm looking for an educated answer.

Thanks
Click to expand...

johniosaif said:
Start off with 5/1 coat let it dry then a 3/1 coat, skim while tacky. No one does a 4mm coat unless its half bonding, thickness of skim depends on background, normally 3mm overall thickness is plenty but some do it thinner
Click to expand...

Here is your educated answer...........................:RpS_thumbup:
 
are you a fireman, or a coarser who can skim ceilings but not walls, unlike the coarser I ran into a few weeks ago who could not plaster ceilings but only walls
 
midiplaster said:
The wall has been skimmed before. Skimmed with something called Plaster.

So effectively, it's old Plaster.

I tried applying a coat to one section of the room, but the suction drained the life out of the Plaster within minutes.

So, I must have got my ratio of water to pva wrong.

I'm looking for an educated answer.

Thanks
Click to expand...

you sound like a bell end mate.. that educated enough for ya ?
 
Read the specs on the jar of uni-bond. Wait to the prime coats dries completely if you want it properly sealed. Then wait until the 2nd coat is tacky before applying your skim


Sent from my iPhone using The Plasterers Forum
 
hector said:
are you a fireman, or a coarser who can skim ceilings but not walls, unlike the coarser I ran into a few weeks ago who could not plaster ceilings but only walls
Click to expand...
they should team up, one doing the ceilings, the other doing the walls,,, THE DREAM TEAM
 
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