From my personal experience on adding pure tung oil to cutting boards after about 15+ coats over a few years(I know that’s a lot of coats over a long period of time) there is now a thin solid surface on the wood. It honestly looks like a thin film finish but it’s all natural.
It is also water repellent to an extent. I think of it as a natural wood stabilizer. The oil penetrates and fills the wood pores then hardens. This prevents moisture from penetrating easily. Now I only apply tung oil once a year to my cutting boards and twice to my spatulas and wood handle knives.
The mineral oil beeswax method is the convenient way of doing it, if anyone wants to use this method I don’t blame them, but it’s my opinion that adding layers of a tung oil over a longer period of time is the proper way of doing it.
When you use mineral oil and beeswax you will remove the top layer after a few washes. Some of the mineral oil will seep further into the wood but will not protect the exterior(the cutting surface). When I used only mineral oil and beeswax I would have to reapply that finish monthly as the wood would visibly dry out.
I’ll leave it to OP which method they choose to use. One is more convenient in the beginning and one is more durable over time.
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