SBR vs PVA

[spader]

Which is better? How do you use SBR for plastering the ceiling on the plasterboard?
I have used PVA before, and it had very little time to finish off the skimming due to plaster going dry far too fast.

Many folks seem to praise SBR for its advantages, but some says it was bad due to not drying fast enough.
Never used SBR before. But I might try using it this time. Are there things to watch when using SBR and plastering?

I am intending to put down either SBR or PVA, and when they go tacky, will put base coat. Then finish skimming.

 

[Wayners]

SBR don't let the water through. Really seals well.
Some water down SBR while others apply neat.
There is a pink SBR now launched by Kirk from YouTube. Look him up and demos.
Onthetrowel is the channel.

Plastering PVA don't seal so well.
When it's dry any water or wet plaster makes it go sticky which also reduces the sealing properties.
Some like that suction as can't stand around all day waiting for plaster to set.
Some like to seal well and use half time in plaster so it sets quicker on well sealed surfaces like SBR.
Then to add more to think about, waterproof PVA seals well vs plastering PVA.
That don't liven up and go sticky when it gets water on it like plastering pva.

So do you want to seal well or have a bit of suction.
Do you want to create a water barrier like over painted artex as any wet can cause original paint to peel away from artex.
So it depends what you are sealing and how well you want to seal on which sealer you use.
As for question.
I sometimes used a watered down PVA on plasterboard and let it dry especially in summer. Just made job easier.
On old walls I used SBR.
Modern emulsion on walls id PVA because the emulsion had already sealed surface, but not enough to plaster plus PVA will bond coats

 

[spader]

Great detailed info, thanks.
Yes, I am planning to plaster the ceiling which is just under the water tank in the loft. The pipe leaked water onto the loft floor, which leaked into the room ceiling made collapse. Hence it would make sense using SBR for any future water leaks. Although I will put down some vinyl under the water tank and pipes after flooring the area first for preventing any future problem even if I replaced the pipe and inserts and shutoff valaves, and now looks solid.

If SBR can protect the plastered ceiling from water leaks that would be just ideal. I wasn't sure how different it would be from using PVA.
I have used PVA in the past with good results, but when water gets in, it just gives up adhesion, which is weakness or strength depending on the situation.

Yes, there seem to be many great videos on using SBR and plastering in youtube. Will keep watching them, and get more ideas for my own use near future.

 

[Wayners]

SBR stops the damp from the wet plaster penetrating surface as this can cause problems sometimes like surface delamination.
Won't do anything to stop further water leaks.
It's on the wrong side of plasterboard to start with plus the water will just run and still cause damage

 

[spader]

SBR stops the damp from the wet plaster penetrating surface as this can cause problems sometimes like surface delamination.
Won't do anything to stop further water leaks.
It's on the wrong side of plasterboard to start with plus the water will just run and still cause damage

I see. Good point to note. Yes, makes sense. Hence the reason I will put down some water proof sheets on the flooring in the loft under the water tank and pipes.