Repairing waterline tiles

In reference to your question about, some folks have used 3M Marine Adhesive/Sealant No. 5200 for their gunite pool. Some will use a latex modified thinset as you would use in a normal install. It should be a mortar mix and not a mastic. Some who were really desperate and stalling for time or money just used regular silicone caulking (if above the waterline) just to hold them over in a pinch. I've seen some chatter about using a 2-part epoxy "Pool Putty" for some small jobs just to tack the tiles back in-place. Maybe one of those options will suffice.

A good place to ask tile questions is Johnbridge.com. Very busy site with a lot of tile experts. Good luck!
 
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