Thistle hardwall what's next?

[Bumer_v]

Hi guys, here is the problem
I've done thistle hardwall on to walls, after that I've primed it with mix of pva/water (now I know that this is a stupid mistake) followed by 2 coats of mapei waterproofing membrane. After 1-2 days membrane started to peel off. At this moment the whole membrane is out of the wall...
My question is what I should use exactly/brand name if possible on top of thistle hardwall to prepare it for tanking followed by tiling?
At this moment I found mapei plaster primer 1litre which I consider most convenient to prime on hardwall it is porous... Don't really know what to do next

 

[Andrew Owens]

Mapei prime grip from Screwfix it's not cheap or a 1kg tub of Tilemaster prime+grip you will probably need to sand off the PVA first.

 

[Bumer_v]

Thanks mate, already solved, like u said, I have used mapei primer 5litres,20£ - worked very well, now on tiling stage...

 

[Andrew Owens]

Good work mate!