Pva Versus Primers | Always Use A Primer When Tiling, And Not Pva

[LM Ceramics]

Re: P.v.a. Versus Primers......

i was once a pva user and so far i havent had a problem with it i only use it for plastering now but now i always use a primer instead of pva

 

[julie67]

Re: P.v.a. Versus Primers......

hi luvlies, im on a course at the moment and last nite Steve who runs the course advised the same, use a primer and not PVA. see I learned something lol x

 

[dock]

Re: P.v.a. Versus Primers......

As another responsible UK adhesive manufacturer, MAPEI, we concur with the views of Bal, Ardex and Nicobond. In addition the primers offered for the purposes of "sealing" a substrate prior to tiling by adhesive manufacturers are generally acrylic co-polymers that once cured do not become "live" when the adhesive is put on top.

Dock

 

[Deleted member 1779]

Re: P.v.a. Versus Primers......

This is great post because I get involved with a lot of builders and plasterers (is that spelt right) who PVA everything in sight.

I've had a lot of plaster work done and the first thing they do is PVA bond the area to prime for plaster.

The problem I had was my bathroom walls were wonky so a plasterer came in and skimmed it.

To fix the skim to the existing plaster he applied a thinned down wet coat of unibond and then went on to skim the wall to get a perfect but thin plaster skim.

THEN the tiler came in, primed the skimmed walls with "proper" primer, (I also used BAL tanking kit on the heavy use area) and he then came back and tiled.

IF there is a point to the post I think it might be that PVA and UNIBOND if used properly (ie by the wet trades when applying plaster) then its a useful boding agent for a builder.

Half my house is unibonded prior to plastering.

Oh yes and one thing I was told (a tip) is never let the PVA dry out. Plasterer said he sometimes goes to a job where the owner has "helpfully" unibonded the area for him a week prior so its dried out. He tells me only wet and week is the only way for it to stick to the plaster and substrate.

[The walls were so wonky a skim coat was applied]

Please tell me if I have got any of this wrong.!

Footnote: Please note words used above describe the same material: PVA, Unibond, PVA Bond,

 

[GazTech]

Re: P.v.a. Versus Primers......

Thanks for your valid and true advice dock, and welcome to the forums....Gaz

 

[macc]

Re: P.v.a. Versus Primers......

hi everybody im a new addition,
so years ago when people said pva it was talking s...! if i was to tile a wall that was emulsioned in a b/room i would key it then use a primer and that would suffice?

macc

 

[floydyboy]

Re: P.v.a. Versus Primers......

This is great post because I get involved with a lot of builders and plasterers (is that spelt right) who PVA everything in sight.

I've had a lot of plaster work done and the first thing they do is PVA bond the area to prime for plaster.

The problem I had was my bathroom walls were wonky so a plasterer came in and skimmed it.

To fix the skim to the existing plaster he applied a thinned down wet coat of unibond and then went on to skim the wall to get a perfect but thin plaster skim.

THEN the tiler came in, primed the skimmed walls with "proper" primer, (I also used BAL tanking kit on the heavy use area) and he then came back and tiled.

IF there is a point to the post I think it might be that PVA and UNIBOND if used properly (ie by the wet trades when applying plaster) then its a useful boding agent for a builder.

Half my house is unibonded prior to plastering.

Oh yes and one thing I was told (a tip) is never let the PVA dry out. Plasterer said he sometimes goes to a job where the owner has "helpfully" unibonded the area for him a week prior so its dried out. He tells me only wet and week is the only way for it to stick to the plaster and substrate.

[The walls were so wonky a skim coat was applied]

Please tell me if I have got any of this wrong.!

Footnote: Please note words used above describe the same material: PVA, Unibond, PVA Bond,

I have been plastering for 20 years now and i plaster over wet and dry unibond the plasterer who told you that is talking through is a-- !!! when skimming over old work i will unibond the day before the reason being the skim will old a lot longer, and when the skim comes into contact with the dry pva it becomes active [live] again it is when you don't dilute it correctly you get the problems to weak does not do any thing and to thick forms a rubber skin over the surface.

 

[planetdeano]

Re: P.v.a. Versus Primers......

Interesting stuff about the PVA v Primers. Appreciate this isn't a plastering forum but figured someone out there would have some knowledge. As the advice goes to use pva in order to seal old plastered/painted walls before doing a re-skim. However i've never found this to be ideal and wondered if it would be better to use a Primer as with the tiling argument, If so any suggestion on type of primer
Incidently there would be no tiling involved............................................................
Also While i'm on was hoping someone would have any advice/contact for tiling wotk in Malta as I'm thinking about heading out that way for a while

Thanks lads/lasses??



edit.....maybe i've found the advice on some posts above

 

[dptiling]

Re: P.v.a. Versus Primers......

top post.:4:

 

[Deleted member 1779]

Re: P.v.a. Versus Primers......

Yes this is turning out to be a very useful post.