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So, retiling my shower. We've applied waterproof membrane and everything was looking great, until it came to tiling. When we started, we noticed in one place it was blistering away from the wall, although not too much so we thought as we were using large tiles it wouldn't be too problematic...

Having taken the tiles out of the shower in order to retile, we found this. How on earth do I attempt to fix this? My assumption is that all the damp is the result of there being no seal between the bottom of the tiles and the shower tray previously, so hopefully reapplying sealant after tiling...