SBR for skimming

Squarehead

Well-Known Member
Used SBR in sand and cement for years but what about as internal bonding agent? If you PVA a wall and skim it the next day it re-emulsifys, but what about SBR would it be like skimming onto plastic and have no sticky bond? Anyone put SBR in with multi like you can with PVA. Would welcome any thoughts or experience.
 

brimplas1

Active Member
I regularly use sbr before skimming. A 4-1 coat the day before controls most suction.... but it's the same as anything in plastering it's about using judgement. ... I use sbr when ever I see grey skim as I find pva will not seal it..... got caught out on a job last year with suction ... pva'd the night before, one more coat when I arrived the next day, unloaded the van, sheeted up and filled buckets then put another coat on just before I mixed and got the 1st coat on in 7 minutes and went back on it straight away as I could see it changing colour and it was solid....... so sbr them now.
 

Squarehead

Well-Known Member
I regularly use sbr before skimming. A 4-1 coat the day before controls most suction.... but it's the same as anything in plastering it's about using judgement. ... I use sbr when ever I see grey skim as I find pva will not seal it..... got caught out on a job last year with suction ... pva'd the night before, one more coat when I arrived the next day, unloaded the van, sheeted up and filled buckets then put another coat on just before I mixed and got the 1st coat on in 7 minutes and went back on it straight away as I could see it changing colour and it was solid....... so sbr them now.
PVA on top of the SBR before skimming? Or skim straight onto fully cured SBR?
 

madmonk

Private Member
I normally Pva as a rule but I've got a couple of tubs of sbr in the van which I'm getting used up so been using that on any reskims nowt wrong with it good to go over
 

roryston

Well-Known Member
Sbr is good on certain backgrounds, hi suction ones its handy but anything else pva is fine.

I found a couple of times the skim has slid about alot on sbr
 

Jgreenplastering

Private Member
If you SBR and let it dry then Pva yours skim won't set.
SBR will kill all suction if used neat and let to dry.
High suction backgrounds will suck it straight in aswell so hard to judge.
If your proper picky Pva then use blue grit.


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jamesthefirst

Private Member
Used bond-it for years but found it didn't kill suction, blue grit even worse.
Cant you get any microgobetis near you as it can be watered down and kills suction great with one coat and a small grit for key only around £40
I have a tub of knauf high suction primer for very high suction and it goes for miles.
 

Squarehead

Well-Known Member
Cant you get any microgobetis near you as it can be watered down and kills suction great with one coat and a small grit for key only around £40
I have a tub of knauf high suction primer for very high suction and it goes for miles.
Thanks for that. Gonna try it
 

barmyuk

Member
ive never had any issues with pva when i glue the walls the day before, would rather do that then wait around for hours waiting for pva to go tacky!!!
 

Arti

Well-Known Member
Cant you get any microgobetis near you as it can be watered down and kills suction great with one coat and a small grit for key only around £40
I have a tub of knauf high suction primer for very high suction and it goes for miles.
Micro is awesome......................:sisi:
 

Squarehead

Well-Known Member
got the tip off another spread years ago and assumed it was common knowledge. If I have a biggie and think I might be chasing it, glug of pva gives you a bit longer. Don't really do it for adhesion but can only help. Only people I've suggested it to that haven't done it in the past have been the Barry big b*ll***s that think they never need extra time and can manage any sized guage....which is a lie and very tiresome.
 

Fishyfingers

New Member
got the tip off another spread years ago and assumed it was common knowledge. If I have a biggie and think I might be chasing it, glug of pva gives you a bit longer. Don't really do it for adhesion but can only help. Only people I've suggested it to that haven't done it in the past have been the Barry big b*ll***s that think they never need extra time and can manage any sized guage....which is a lie and very tiresome.
 

Fishyfingers

New Member
I was told years ago bicarbonate of soda will slow set time down,we had a batch of board finish years ago doing an old peoples home and it was of like f**k,we sent lad to Boots,got bicarbonate and it did seem to work
 

JohnDoe

Active Member
I worked with a bloke some years ago who like to put pva in his skim so I let him to all the mixing. It was fcuking horrible to use. Was like chewing gum. Didn't notice I'd we had longer. I was more concerned about using the horrible shite. Never worked with him again. Haha
 

Pug

Well-Known Member
got the tip off another spread years ago and assumed it was common knowledge. If I have a biggie and think I might be chasing it, glug of pva gives you a bit longer. Don't really do it for adhesion but can only help. Only people I've suggested it to that haven't done it in the past have been the Barry big b*ll***s that think they never need extra time and can manage any sized guage....which is a lie and very tiresome.
Wish I'd tried that yesterday. Only 2 x 20m2 sets on board but awkward areas and humid as a sauna. Chasing after it like a mofo.
 

Squarehead

Well-Known Member
Wish I'd tried that yesterday. Only 2 x 20m2 sets on board but awkward areas and humid as a sauna. Chasing after it like a mofo.
Humidity is the killer. Only gotta lift my lunchbox and I'm sweating like a swine. It does make the first coat a bit gloopy but it's only the first coat and it only needs a small glug. Put slightly less water in the bucket to major make a full bucket. Need to add a bit more multi than normal.
 
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