Mastic replacement - How important is it to remove ALL old mastic?

Undeadpickle

New member
May 31, 2020
4
San Jose
Hello, I am currently replacing all of our old pool mastic. I got the majority of the old stuff out but there is still a bit stuck to the side of the flagstone decking which is quite difficult to remove (see photo). Is it ok to leave or should I use a grinder or some other tool to try and remove it all completely? Thank you!
 

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