Travertine 'holding water'?

MCF50 - it's been a while, has anything changed with your coping?
I have cast concrete coping in Southern California with virtually no rain and am facing the same issues (I started thread Pool Bellecrete Coping Moisture Problems for it)
Is there supposed to be some sort of sealing of the top of the gunite bond beam before installing coping and waterline tile? Mine was not. Just regular thinset/mastic/whatever used to set the stones. Perhaps this is the root of my issue??
 
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