Why on earth would you scrap the Kerdi system? What was it exactly that you weren't comfortable with?
What do you mean by "gaps" exactly? And what do you mean by "pre mixed"? Just that the latex additive is already in the powdered thinset?
There is no problem with adherence of modified or unmodified thinset to each other in general.
What do you mean by "gaps" exactly? And what do you mean by "pre mixed"? Just that the latex additive is already in the powdered thinset?
There is no problem with adherence of modified or unmodified thinset to each other in general.