When you say Tung Oil Finish I assume you mean a 100% Polymerized Tung oil. There are many varnishes that have Tung oil in them that are marketed as Tung oil finishes despite not being much different than an oil based polyurethane.



With that said, I don't believe a 100% tung oil finish is acceptable for sealing a wooden snake terrarium. In my opinion you really want more of a finish that sits on top of the wood and makes for a smooth and easy to clean finish.



I now discourage people from using oil based polyurethanes in animal enclosures. Too much to explain right now, but the short story is that if they are not supposed to be used inside of a sock drawer then by no means should they be used in a cornsnake cage.



Waterborne polyurethanes are okay but don't offer a lot of moisture and chemical resistance. Might be okay in a cornsnake cage provided the cage itself was low humidity and it had access to a moist hide area. Even then I would do something more durable for the floor -- scrap vinyl flooring, self-adhesive shelf liner, or something.
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Currently keeping:



6.10 Gonyosoma oxycephalum (Javan, mixed colors)



0.0.4 Rhynchophis boulengeri



1.1 Philodryas baroni



1.1 Lampropeltis triangulum multistriata



0.0.1 Rhamphiophis rubropunctatus



0.0.2 Morelia viridis (Aru & Merauke locale types)



1.0 Rhodesian Ridgeback

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