Ceramic tiles crazing ? Baffled ? Advise please !!!

[Jelthetiler]

20mm adhesive? Would've been cheaper and quicker to re-skim with plaster! What's the name of the tile manufacturer?

Primer/SBR to seal stick areas. I was told that Mapei (for instance) will not guarantee their adhesive if it is stuck over PVA.

 

[Gez2312]

They were British ceramic tile .

20mm adhesive was not everywhere ! A lot of it was tight back to the wall , but it bellied in the middle. Can't see how this would make the tiles craze though ? And co incidentally the tiles are crazed more away from the deeper adhesive , also when I said pva'd I did mean primed ! Just force of habit saying pva !