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.
It doesn't *take* all kinds, we just
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