Okay, to throw a wrench in this- how do you think the new formulations of thinner ("Safe thinner, I wouldn't call them solvents) affect all of this? In my experience, the original formulations of solvents/thinners were pretty predictable in how they reacted with "Tung oil" and other oils, but the new formulations, courtesy of our friends in California, are just a pain to work with and in my experience pretty unpredictable in how they react with finishes. Now, try to find the "original formulation" thinners these days...
The other thing is, what lots of guys are calling Tung Oil may or may not be actual Tung oil unless you can determine it's chemical content from the label, if the manufacturer is generous enough to supply one. Most of the cans marked Tung oil these days are filled with a synthetic material that is definitely not plant or animal based. This can also cause difficulty with predicting how materials will react with solvents and other materials called thinners...
Bob
