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...I agree that it should be coated with a few coats of thickened epoxy...
Actually, I suggested unthickened--to permeate the wood somewhat, particularly on the bottom. The penetrating type (extra-thin) is also an idea, again especially on the end-grain, although I would add a coat of regular epoxy to add more of an exterior barrier. All of this might be overkill with pressure-treated fir.
Dave Bristle Association "Port Captain" for Mystic/Stonington CT PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired), Now on Eastern 27 $+!nkp*+ Sarge
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.