Rock siding
I have not worked with sand rock siding so I am unsure what exact products to recommend. However I am sure you must find a way to stop the water from staying on the top ledge. Mortar comes to mind, I would try and make a tapered ledge on the top of the wall to shed the water away from the wall. Then you could fill the cracks with a epoxy look for one recommended for concrete repair for a strong bond or at least seal the cracks with a caulk to help prevent leakage and additional cracking.
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Mgmopar
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