Bonding Agents/stabilisers/primers!??

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TedTheSpread92

New Member
Okay so it's an absolute minefield out there at the minute with all the different products out there.
I just want to know what is your preferred method when it comes to dealing with high suction backgrounds. Wickes bonding agent, PVA, SBR, Blue grit, gypPrime, bond-it.

As I'm aware it does actually say that Thistle bond-it is only really meant for smooth backgrounds with low suction??
So would all bonding agents be out of the question?. If that's the case would you need to prime it first and then put on a bonding agent???
 

TedTheSpread92

New Member
Honestly, I have always used PVA to be fair however my last job stumped me was going over walls which had wallpaper taken off and was taken back to old concrete surface. Knew it would pull in quick just from touching it so gave it a good primer coat the day before, then another two the next day trouble was PVA didn't pull in nowhere near as quick as expected and stayed tacky for quite a while. Jumped on when tacky and it had pretty much gone by the time I went to flatten 1st coat. Crazy paving trouble as well??
Was not a big wall at all either it was literally a matter of minutes.
 

brimplas1

Well-Known Member
If high suction I put a 3-1 sbr on it the night before and then a 3-1 pva before skimming... If very high suction 1-1 sbr which will kill all the suction and a coat of pre grit for a key....
 

McBentLegs

Well-Known Member
PVA. #why would you use anything else.
Agreed, however had a total nightmare the other day, 3 coats of thick glue for first set and still sucked the life out of it.. by the end of the day had crazed badly and turned pink.

Second set, 5 coats of thick glue and just about controlled it.. all over old grey skim and artex, not experienced anything like it, wasn't majorly hot either.

If I was doing the rest of the house I almost certainly would have used some SBR.

Now today.. totally different job, grey skim, two average coats of glue.. totally sealed it and killed suction.

The joys of plastering!
 

McBentLegs

Well-Known Member
Honestly, I have always used PVA to be fair however my last job stumped me was going over walls which had wallpaper taken off and was taken back to old concrete surface. Knew it would pull in quick just from touching it so gave it a good primer coat the day before, then another two the next day trouble was PVA didn't pull in nowhere near as quick as expected and stayed tacky for quite a while. Jumped on when tacky and it had pretty much gone by the time I went to flatten 1st coat. Crazy paving trouble as well??
Was not a big wall at all either it was literally a matter of minutes.
Exactly same problem I had Monday.
 

TedTheSpread92

New Member
Love this job haha. No matter how much we know always something round the corner that makes you feel like you're back at school. So I'm guessing here then if the suction is very high sbr day before will do the trick?
Never used it to be fair haven't needed to but don't want that happening again to me as it was a bugger getting it up to standard.
I just want the easy life.
Just thought I'd add same job is coming up again soon with the same background so will approach differently.
 

bobski

Well-Known Member
Okay so it's an absolute minefield out there at the minute with all the different products out there.
I just want to know what is your preferred method when it comes to dealing with high suction backgrounds. Wickes bonding agent, PVA, SBR, Blue grit, gypPrime, bond-it.

As I'm aware it does actually say that Thistle bond-it is only really meant for smooth backgrounds with low suction??
So would all bonding agents be out of the question?. If that's the case would you need to prime it first and then put on a bonding agent???


SBR - and the longer to dry the better.

Always carry a can or two.

If you can't get hold of some at short notice, I've found most tile primers are also a similar make up. Acrylic based are also really good at killing suction before a final pva or whatever you are choosing to bond.
 

McBentLegs

Well-Known Member
SBR - and the longer to dry the better.

Always carry a can or two.

If you can't get hold of some at short notice, I've found most tile primers are also a similar make up. Acrylic based are also really good at killing suction before a final pva or whatever you are choosing to bond.
That's a good point, acrylic tile primers are very good at completely killing all suction.
 

Wayners

Well-Known Member
I'm still on the artex sealer. I buy from weston super mare building merchants and comes overnight delivery. Water it down and 2 coats. When dry skim no problems and never failed me in all the years I've used it
 

TedTheSpread92

New Member
This is what I am talking about here, lots swear by PVA alone and there are those out there who use completely different products. My old man said to me just the other day that PVA was pretty much the only thing that was readily available. But then it's a different age now with lots and lots of products on the market.
 

Wayners

Well-Known Member
Waterproof pva is just that and seals well, but plastering pva don't seal as well but dose liven up, so I guess 1 waterproof pva followed by a plasters pva would work well. Seen here that sbr + pva mix 50/50 works (not recommended mixing) but I think sbr on its own or pva on its own is what most here will use. Then blue grit. And everything else costs to much and not easily available.
 

smoother09

Well-Known Member
Put some vinegar in it to give it a acidic pH level which will completely alter the PVA thus giving the performance of the substrate a much more playable character leading to superior application and finish!! Only malt vinegar like you put on your chips ask in building supplies all plasterers are using it (y)
 

jamesthefirst

Private Member
I'm still on the artex sealer. I buy from weston super mare building merchants and comes overnight delivery. Water it down and 2 coats. When dry skim no problems and never failed me in all the years I've used it
I did loads of artexing years ago and we used loads of artex sealer, I’ve never thought that skim would stick to dried artex sealer so never risked it. You ever skim onto dried Zinsser products?
 

Wayners

Well-Known Member
I did loads of artexing years ago and we used loads of artex sealer, I’ve never thought that skim would stick to dried artex sealer so never risked it. You ever skim onto dried Zinsser products?
Plaster sticks really well to artex sealer.. Never had any trouble over many years. I also use prior to sticking coving and having removed myself at home with my loft conversion and the odd occasions on jobs it's a nightmare to get off vs others I've not fitted that falls away. They should market it as a pre plaster primer imo
 
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