O
One Day
Tanking liquid painted all over the tray you say?
So an SBR (maybe water-based) liquid onto a sanded composite.
Probably hasn't bonded well at all. Then the tile adhesive which will bond very well to the tanking liquid has probably also helped "pull" the now-dried tanking further off the tray.
I always fix a waterproof membrane like Kerdi or Mapeguard WP to trays using something VERY sticky like Ardex WPC or Kerdi-col. Never had the problems you have here.
The blame is with poor advice first from your supplier but also really with the installer who should know better, or have checked.
...I just checked, the Norcross tanking kit is water based so it's never going to stick well to composites.
So an SBR (maybe water-based) liquid onto a sanded composite.
Probably hasn't bonded well at all. Then the tile adhesive which will bond very well to the tanking liquid has probably also helped "pull" the now-dried tanking further off the tray.
I always fix a waterproof membrane like Kerdi or Mapeguard WP to trays using something VERY sticky like Ardex WPC or Kerdi-col. Never had the problems you have here.
The blame is with poor advice first from your supplier but also really with the installer who should know better, or have checked.
...I just checked, the Norcross tanking kit is water based so it's never going to stick well to composites.