after 24 hours, 1" of water held with no loss of water. I did see the wicking around the sides per prior photo. The rep indicates if no leaks, its good. I saw in your the johnrjfwhipple post above from 2009 you noted wicking...is that what lead to using ardex on the seams?
I hadn't gotten to the hardware store to get a plug, so I used plumbers putty and the putty cup, it worked perfect to my surprise, there was no leaking.
I did find two places my install was out of spec, where there was not a 2" overlap, only 1.5", so I am going back over that with Kerdi strips. also found one area that didn't adhere well, so cutting that and patching it, then will do another flood test, in a few days.
I read one of Johnfrwhipples prior posts and saw some things I hadn't seen before, so am re-stating. namely: install Kerdi with the markings out. I wondered when I was installing if there was an inside and outside, but don't recall seeing that stated in the Kerdi install book. Is that still true or is that for an older version of the Kerdi? I hadn't asked Schluter that question as yet.
the other thing is not to use old thinset. I was going to use some old Versabond fortified thinset to install the suntouch heating coils. as long as it adhere's to the plywood and is solid when cured I was thinking it was ok prior to reading the comment. am I missing something or just taking risk with $20 that isn't wise? overtop of this would go ditra then the tile. I'm going to mix some up and do a sheer test on it just to see how it performs. prob buy some new thinset anyway, but curious if it still works.