Waterproof coping mortar

[Akuhn]

I have this same problem (small cracks in coping mortar up to about 1/16” or so) and thinking freeze/thaw cycle this winter will worsen. Has anyone used a sealer that might fill these cracks?
Coping is flagstone and hoping to find something I can reapply over itself every few years as needed without having to remove the previous sealer.

 

[ajw22]

Coping mortar should be filled with mortar, not grout.

Post some pics of the problem areas.

 

[Akuhn]

Here are a few pictures of the small cracks I’m trying to keep water out of. Hoping to avoid sealers that require removal before reapplication. Any suggestions?

 

[Akuhn]

The best plan I can come up with is to use a siloxane type penetrating sealer to seal the flagstone and mortar, using one that will darken the stone to a “wet look” without putting a film over the stone like a poly or acrylic sealer.

The siloxane sealers are too thin to fill the 1/16” cracks so thinking I may need to somehow inject these cracks with an acrylic based sealer after the siloxane has cured (big box stores sell a gallon for about $35).

Can anyone poke holes in this plan or offer other suggestions?

Thanks in advance.