Mapei Primer G dilution - self levelling

[Andrew W]

Hello

I'll be laying some ceramic floor tiles on top of self levelling compound, I've got some Mapei Primer G but I'm not sure if I should dilute it.

Instructions say:

Before tiling on gypsum it says to apply neat, ( does this apply on top of self levelling?)

Also says do NOT apply in such a quantity that it forms a surface film, dilute with water as appropriate for the absorption of the substrate. Obviously self levelling compound is highly absorptive.

I did apply it neat but it didn't get absorbed into the self levelling as I scraped some up later when it was dry, should it be absorbed as it scraped up really easy and I'm confused?

Thanks

 

[White Room]

Thin it down so it soaks in rather than sitting on the surface...

 

[Andrew W]

Thin it down so it soaks in rather than sitting on the surface...

Excellent.

I didn't expect anyone to reply so quickly - Thank You

 

[Ajax123]

Is your primer quite old because I would swear they changed the instructions to say dilute primer g

 

[Andrew W]

The date on the bottle is March 2014.

The instructions on the small 1kg bottle aren't sufficient really and they don't say whether to dilute it or not, just to apply.

But the online PDF does say to apply neat when applying the primer on top of gypsum before tiling.

 

[Andrew W]

Well, just rang Mapei and spoke to someone in the technical department.

They say if I'm tiling on top of self levelling compound then I don't need to apply any primer before tiling.

He said the Primer G could've been applied before laying the self levelling.

You would think self levelling was similar to gysum where the pdf does say to use a primer. :whatchutalk:

 

[Ajax123]

The date on the bottle is March 2014.

The instructions on the small 1kg bottle aren't sufficient really and they don't say whether to dilute it or not, just to apply.

But the online PDF does say to apply neat when applying the primer on top of gypsum before tiling.

Ok.

 

[Andrew W]

I thought I may aswell phone Mapei Technical who said that you can tile directly on top of the self levelling without applying their Primer G product.

Then I came off the phone and I was thinking he never asked anything about the self leveller, I know the primer is for applying over gypsum and anhydrite based products.

So I diluted some and applied it, it cannot do any harm.

Thank you

 

[White Room]

if the self leveling has just been laid then you would be fine but if it's been down a while then I prime before fixing any tiles.

 

[Stef]

I always prime slc before I tile, it's only to remove any dust & to give me a better key onto the surface.
It won't do any harm to prime.

 

[Andrew W]

Thanks

Hopefully I'll get the tiles down tomorrow.

 

[Jelthetiler]

Completely agree Stef. I'd rather prime anyway rather than wish I had after. For the sake of a tenner per job (one litre of primer and a foam roller) I prime virtually everything. If it doesn't move, prime it!!

 

[SLD]

Mapei will have assumed you used their ultra plan renovation screed which is a flexible leveller as you said self levelling compound, in order to get the 25 year guarantee they offer you must use Mapei products from start to finish. It does no harm to prime just additional cost & time.