Joe... When I did my testing on tung oil a couple years ago I found pretty much the same results, the harder the wood the better the penetration,,,,, I also found that I could get tung oil to literally penetrate ALL the way through a large dia. birch Darter... I learned some cool stuff during that testing phase,,,, I also enjoyed cutting the test blanks in half to see the results,,,,,
The tung oil I use is not pure but it seems to work pretty well and a gallon is fairly reasonable although the price has doubled in the last two years,,,,,,,
I do agree on the hard woods getting slightly harder with the tung oil,,, on WRC I found that my best results were achieved with a good penetrating epoxy applied directly to a heated blank,,,,,also the tighter the grain on the WRC the better results I had....
Good luck on your new sealer and I cant wait to hear about your findings,,,,
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