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I would like to know what is the safest wood treatment what I can get in stores? Also what food safe wood treats there are? I was considering to use Beeswax or Walnut oil - are they okay with smoke and high t*?
For treating the outside I wouldn't be super concerned. Your food isn't in direct contact. Most metal smokers and BBQ's have an exterior finished with paint.
I'd go with a good water based polyurethane if you're looking for a clear finish. For a paint grade finish use bbq paint, or high temp. That will be overkill as a wood smoke house shouldn't reach high temps anyways.
For the interior the smoke will take care of protecting the wood.
Ah... a smoke house, that is outside and exposed to the elements I assume. In that case I recommend a good quality spar varnish, it is made to stand up to the elements.
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