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Unread 04-20-2021, 04:25 PM   #6
Tile Setter
Join Date: Jul 2003
Location: Sarasota FL
Posts: 1,835
mastic IS NOT made for wet environments. your pics show the lower area of shower,which coincides with where most of the water will be,in a shower. Delamination/voids seem to be evident,within adjacent tiles,lower area. think your answer lies within what you used as an adhesive,not the backing substrate.
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