Update... Here below is an image of the top taken after about 5-8 coats of Tung Oil. I start with two to three poured on heavy coats, then I wet sand with 600 - 800 grit US sand paper. Then I begin applying thin coats, usually three with wet sanding 800 grit between. As I get closer to my finish coat I start using 1200 to 2000 grit depending on the desired finish look. I haven't done many guitars but I have built a lot of boats and furniture where it seems to work well. Tung Oil is extremely tough, gets tougher with age, and is not toxic to user. I give the heavy coats 12 - 24 hours to set up, the thin ones I re-apply after 3-4 hours but let the three coats set for 12- 24 hours before sanding.
Some more images in natural light.
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