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The temperature of the lather isn't a problem for me, even though when I was using the moss scuttle it was quite pleasant.
So, yeah you'll just have to keep your brush/lather in a warm vessel. It...

it's supposed to.
as far as keeping the lather warm, a double walled scuttle is the solution to this, however i'm not sure why is the cooling lather a problem. perhaps you mean your lather is drying...