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

Members online

Status
Not open for further replies.

midiplaster

New Member
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
 

RoryOB

New Member
Good question, interested to see the responses
i say mix water into the pva stir until it's not thick/glue like/lumpy
 

midiplaster

New Member
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!!
 

Nisus

Elite Member
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:
 

johniosaif

Private Member
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
 

Nisus

Elite Member
Said it's been skimmed but the title says old hmmmmmm

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

:RpS_unsure:
 

Marshy

Private Member
This guy sounds too technical to be a spread?? And what the hell is a "correct procedure" ?? :RpS_laugh:
 

Arti

Well-Known Member
PVA is yesterdays chip paper.......................IMO or BMO is this years must have.......................:RpS_thumbsup:
 

midiplaster

New Member
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
 

Arti

Well-Known Member
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

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

Here is your educated answer...........................:RpS_thumbup:
 

hector

Well-Known Member
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
 

cassie

Well-Known Member
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

you sound like a bell end mate.. that educated enough for ya ?
 

cooptaza

Active Member
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
 

leebo02

Well-Known Member
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
they should team up, one doing the ceilings, the other doing the walls,,, THE DREAM TEAM
 
Status
Not open for further replies.
Top