Coping Stones and Caulk recommendations


New member
Jun 9, 2019
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.
Admins - if this should be in a different topic, please move


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  • Hairline crack caulk.JPG
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Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
Pool Size
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Type S mortar should be used around coping stones.
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