With that many coats of tung oil, has it had a chance to completely cure?
Completely, and I'm sure because...
How long do you wait between coats of tung oil?
About fifteen seconds before touching it, and I checked every time to see if I could leave a fingerprint or scratch with moderate pressure from my fingernail. I apply pretty thin coats so who knows how much that's helping, but here in western Washington this stuff doesn't lose its tack in an hour so I know something's going on here.
I need to get some of that armour-all stuff and experiment with this idea. Have you tried it with tru-oil yet?
I haven't but got this idea from a thread I saw a couple months ago, something about giving back, where a gunstock was finished with tru-oil via this method.
Armor-all contains glycerin which attracts and holds water better than a piece of hickory. What exactly are you hoping it will do?
It dried the tung-oil. A dozen coats hard as glass in an hour, and all in western Washington's less-than-dry climate. Some days a single coat won't dry in that time, especially if you get impatient and put more on a still-tacky coat. Basically I'm looking to get the same results as we saw in that other thread.