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Good point Max.
Don't go rubbing Tung oil "finishes" with sand paper, only pure oil is safe for burnishing in.

No, Tung works great on hardwoods as it quickly fills the dense grain. Especially if rubbed in as a light dust slurry at about 600 grit.
Softwoods would benefit from a sealer coat first or use up...

Tung oil will harden "in" the wood & give you all the protection needed but you should avoid water on it till it does ~ maybe a week or so. That said I avoid water on my scales any way.
CA will...