Photo: John W. Taylor
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Ladle the mortar into a grout bag or a zip-top bag that has a ½-inch-diameter hole you've snipped in a corner. Squeeze the mortar out in a smooth motion, forcing it to the bottom of the joints. Fill them up to 1 inch deep in one pass, leaving the mortar just proud of the stones. Deeper joints should be half filled, packed down with the trowel, then topped off. If any mortar lands on top of the stone, scrape it off immediately.
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