Coping Stones and Caulk recommendations

SilverSpringpool

New member
Jun 9, 2019
4
Silver Spring MD
I have several spots where the grout between the coping stones is either accompanied by small (hairline) cracks or broken, missing or clearly in need of repair.

My questions about the grout are 1- do I worry about the cracks or ignore them, 2 if I should fill them, what is the best material and 3- is there a recommended concrete sealer I should use after I pressure wash the mold from the stones?

Also seen in the photos below are several sports underneath the stones where they meet the pool tiles. Several areas have gaps that extend, I believe, to behind the tiles. Obviously I want to seal these gaps so water doesn't get behind the tile. Any recommended materiel to seal these gaps? (I presume it is different from the grout material).

Thanks in advance.
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