A friend has made a red oak board bow. Looks great, but he is insisting that one coat of tung oil is all that it needs. After being around wood for a long time, I know that it is not the case. I have used custom bows and basses, and never have I heard of one coat of anything.
It already looks like it is drying out on him. How many coats should he apply, and then what to seal it? Wax, poly, or something else. I'd hate to have him lose it cracking or splitting.