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

[White Room]

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

I've used both for priming

 

[doug boardley]

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

I've not used bal primer, but I'm always prepared to use an sbr dilution of 1:3, (sbr: water), I do keep bottles of ultra, flex prime and Primer G in my van for when I use said addy's

 

[Colour Republic]

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

I've removed a laminate floor at my house as it was always spreading at a certain joint and im sick of "jump & sliding" it back together. Dont tell me you dont know the jump and slide "move" cos i know you do!!

:lol::lol: I thought i had the copyright on that move!

 

[DHTiling]

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

here's a question for you all...

I've removed a laminate floor at my house as it was always spreading at a certain joint and im sick of "jump & sliding" it back together. Dont tell me you dont know the jump and slide "move" cos i know you do!!

anyway, the reason it kept popping at that certain part was down to the gargantuan drop the bitchumen/ashphalt floor suffers at that point. I intended to self level and tile, but after ringing BAL technical this afternoon to find out the best primer (not PVA) to use on Bitchumen, only to be told they dont recommend doing anything with bitchumen other than removing it completely.

Removal is not an option as this was poured in and floated in when i bought the house (built circu 1927) to act as a damp proof barrier. Its not a thin layer originally used to fix vinyl tiles etc, im sure you will all know what i mean?

So whats my options here? I've been and bought BAL Bond but im at pains to just go ahead and use it without asking first. I intend to tile the floor in the end by the way.

PCI do a self adhesive bitumen faced membrane which is fleeced on the side you tile..perfect for sticking to bitchumen...

 

[Roscoepeko]

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

Blimey, i am the untrained but have used PVA at home and wont use again - i do have a litre of tilers primer unopened which i thought was just rebranded pva !!

Now I have a garage floor to sort out it has never been treated painted sealed primed PVA'd ect. and went out and bought a big tub of pva to put on to "seal?" it whilst i decide weather to use an epoxy type paint or standard garage floor paint - one manufacturer of the epoxy says not to pva and now i can see why ! ....but would Palace tilers primer (the 1l unopened bottle) be a suitable product to put down as a temp fix and then paint at a later date?

Sorry if painting is offtopic on a tiling forum

 

[Ajax123]

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

Blimey, i am the untrained but have used PVA at home and wont use again - i do have a litre of tilers primer unopened which i thought was just rebranded pva !!

Now I have a garage floor to sort out it has never been treated painted sealed primed PVA'd ect. and went out and bought a big tub of pva to put on to "seal?" it whilst i decide weather to use an epoxy type paint or standard garage floor paint - one manufacturer of the epoxy says not to pva and now i can see why ! ....but would Palace tilers primer (the 1l unopened bottle) be a suitable product to put down as a temp fix and then paint at a later date?

Sorry if painting is offtopic on a tiling forum

Epoxy paint over PVA not really anything to do with the issues about PVA although your paint would still peel off. This is because epoxys depend on mechanical key and as such need to achieve a certain level of penetration into the substrate so that they can grab onto it. If you need to rpime the substrate you should use a penetrating epoxy primer. This will penetrate inot the surface and provide "grab" but as it has penetrated it will also have a contoured surface following the conours of the concrete thus providing a surface that the paint can mechanically bond to.

 

[spooney55]

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

Great advise to me as a newcomer to tiling.
much better to spend a few quid more doing the job right, than getting a bad name later, costing time and money putting it right.

 

[negsy26]

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

what about webber pr370 ? thats described as - a synthetic water based pva concentrate for sealing and primming building substrates. is it ok to use that prior to tiling then ? !! im confused !!! lol

 

[nudge]

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

My gosh - what an exhaustive read from start to finish! that was - :dizzy2:
i can hardly get anyone over here to even use a primer/sealer let alone discuss which type is best! - but it would seem to an outsider that there is a bit of confusion in terminology going on & some untrained adhesive reps & others might some times unwittingly profligate the problem.

I believe we should seal a substrate which is thirsty so that the adhesive cures proberly or we should prime a substrate that is suspect or hard to stick to and if neither of these is the case don't bother - the adhesive is tested without and is more than capable of bonding to most common surfaces.

Primer G diluted 4-1 for sealing
Primer S water resistant primer
Mapeprim 2 part water based epoxy for problems

p.s. sometimes it isn't a matter of can we bond to a particular substrate - but should we -i.e. bitumen - chip board etc. we stick to them but they don't stay stuck to themselves and delaminate.

 

[christine]

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

Hi,
So if you already have coated the rendering with PVA how do you get it off so you can apply primer? I never knew tiling was so complicated!
Thanks a lot Christine

 

[White Room]

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

What made you apply pva to render, did you thin it out or put it on neat

 

[christine]

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

What made you apply pva to render, did you thin it out or put it on neat

we used 4 parts water to 1 part unibond

 

[White Room]

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

Quite thin so may have soaked in, could (in the shower area) apply hot water and using a scrubbing brush on the surface and clean water to remove any residue

 

[christine]

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

Quite thin so may have soaked in, could (in the shower area) apply hot water and using a scrubbing brush on the surface and clean water to remove any residue

do we then prime it when dry? Do we just prime the other walls on top of the unibond or will that then be a case of the adhesive just sticking to the primer which is sticking to the unibond! Never knew tiling was so complicated perhaps someone should introduce an "idiots guide" for people like me!

How do we prepare the plywood floor ? thanks a lot

 

[White Room]

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

Should have no need to prime render unless it may be dusty, leave the other walls as the unibond you put on was quite thin.
i take it that the ply is already down, normally the ply would be primed uderneath where it sit on the floor boards and edges to stop any moisture ingress, check the information on the adhesive bag wether it needs priming or not on the surface your going to tile