You can improvise a double boiler with some glass marbles. Just put an inch or so of water in a larger sized kitchen pot, drop some marbles in it, and set your wax can on top of the marbles.
But it still needs constant attention for safety reasons.
You can also use a stainless steel mixing bowl set on top of a pan of boiling water as a double boiler. Works better then most commercial double boilers.
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A gentleman should always be able to break his fast in the manner of a gentleman where so ever he may find himself.--Good Omens
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