Pool Waterfall Maintenance?

[pgershon]

My pool waterfall works by diverting water from the returns to a pipe on a rock and letting the water flow down the rock and into the pool. I have some issues with water loss as some water flows through grooves in the rock onto the coping stones or even behind the rock. I was able to fix a lot of the improper flow with epoxy pool putty. It works well when the white putty can be hidden behind rocks. But I’d like to plug a few grooves in the front of the rock, and fear the white will be an eyesore.

Is there any waterproof colored putty available that could blend well with a grey rock? Photos below: thanks

 

[JoyfulNoise]

I would suggest using additional stones with waterproof masonry mortar or hydraulic cement. There are masonry stone mortars that provide a decent grey color to help blend into the stones better.