I use LV polymerized tung oil sealer on some of my turned bowls to bring out the grain before finishing with my usual finish. It works great on sweetgum and chinaberry, dries overnight and is ready to steel wool and finish the next day.
I may use it every day for a few days but usually about once a week. After a few uses the remainder in the can will start to gel and the rest is wasted.
I tried using propane to remove the air from the can--a light blast from a propane torch (unlighted) and this helped, but eventually the tung oil gelled. I tried using freon from an AC refill canister. The next time I looked at the can, the freon had apparently dissolved in the tung oil and the can had partially collapsed. Bloxygen works, but is almost as expensive as another can of tung oil.
Then I bought a cylinder of nitrogen from my local auto parts store. We modified a medical O2 pressure reducer to fit the cylinder. I attached a piece of Oxygen tubing from the hospital and used 1' length of copper tubing for a wand. Have been using this over a year and there has been no gelling of the tung oil. After each use I blow out the can with nitrogen (just enough pressure that I can feel it coming out, not a blast).
After you buy the cylinder a refill is cheap, so they told me. So far I have not used the nitrogen up that came in the cylinder. The cylinder is about 5" diameter and 15 inches high.