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How many coats of tung-oil?

IME....I would always error on the fewer coats the better, it will depend on the sheen you wish and/or the amount of protection you wish to get...Tung-oil provides very little protection.
I have had better experience with cheap tung-oil (off the shelf at home depot) its easier to work with...dosent set up as quick and has better penetrating properties...more (extremely) light coats.....0000 steel wool in between...cleam between coats...dry times will vary with temp/ type of wood and the amount of coats already applied...take your time...tung-oil is a great finish...
 
Years ago I refinished a body using four coats of tung oil with light 0000 steel wool between coats, waiting two days each time to allow it to fully dry.
Afterward, I kept it up with light applications of Butcher's wax every couple of months for the first year or so and then once a year after that.
It was a nice finish cosmetically, and it felt nice to the touch, but offered little protection from anything other than humidity.
 
Yesterday's oil formula is likely to have no bearing on today's formula. Each manufacturer has a different concoction. Results will vary.

Repeat the mantra: Practice on scrap!