From
https://en.wikipedia.org/wiki/List_o...conductivities
Quote:
Manganese 7.810[4] Lowest thermal conductivity of any pure metal.
Fiberglass or foam-glass 0.045[5]
Pine 0.0886—0.102
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This is in (W·m−1·K−1) (whatever those are) not BTU.
Calculator here. But generally, my interpretation is that stainless steel is 1/10th the conductivity of aluminum, twice the conductivity of Manganese and 20x wood or fiberglass. Which is why I recommended the insulation.
3mm of wood isn't going to be very stout.
IIRC White Southern Pine has waxes that phase change at room temperature, but I can't find a reference. And there is some issue with 'setting' the resin for woodworking that might affect the result.