Repair water leaks in kuksa with coffee

Fill the water leak with coffee stains to repair the water leak. Easy repair just leave it alone.
Material
Tool
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A box containing kuksa
Commentary
Preparation
Make
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In my case, there was a lot of water leakage, so I first put filter-type drip coffee grounds in the empty kukusa and rubbed the inside of the kukusa with the capacity of a sesame grinder to make it finer.
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Put the kuksa in a container and add hot water to make coffee so that the water doesn't leak.
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Let it sit overnight with the coffee in it.
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Throw away the coffee and let it sit again overnight without rinsing.
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After letting it sit overnight, add water without washing it and leave it for several tens of minutes to check for water leakage. If it still leaks, repeat steps 2 and 3.
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Finally, wash the coffee and leave it in the water to make a final check for water leaks, and if there are no leaks, the repair is complete.