Trivia minute: Tung oil is also called (or used to be called) China Nut oil. It was used to finish the wood stocks of America's rifles and carbines in WWII. There were huge groves of the trees that grow the nuts and they were classified as "Strategic War Production Material" and were fenced in and protected.

The oil obtained went into large tanks that were heated and a mechanical conveyor system dunked the Garand and Springfield stocks and handguards in one end of the tank, pulled them submerged to the other end of the tank and then the stocks were hung up to dry.

My favorite sergeant made fine hardwood furniture with tung oil finishes on some as a hobby. Work in enough coat/dry/sand/recoat cycles and you can get an almost glass-like finish that is quite hard ad fills all the wood's pores.