what adhesive product is recommended to repair lose flag stone.

Hello,

I have noticed that sections of flag stone have come lose on our spa. A few of them are where the water over spill occurs and a few on the top beam of the spa. What is the recommended product on securing the flag stone back onto its designated spot?

Thanks in advance.
Pretty sure you want to use some sort of type s mortar to do that.
 
Example of such?


 
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