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Nice looking cup Jim
I believe coffee grounds are the traditional way of sealing a Kuksa.
A bunch of the beer swap mugs over the years have been epoxy coated on the inside, so it definitely works OK for cold drinks, I wouldn't have thought coffee was hot enough to do anything to epoxy, so I think that would work.
Walnut oil should work as well, just need to let it fully cure before you add a drink to it.
I believe coffee grounds are the traditional way of sealing a Kuksa.
A bunch of the beer swap mugs over the years have been epoxy coated on the inside, so it definitely works OK for cold drinks, I wouldn't have thought coffee was hot enough to do anything to epoxy, so I think that would work.
Walnut oil should work as well, just need to let it fully cure before you add a drink to it.
