Tony, Tung oil is fantastic stuff, but it does need renewing every couple years, and more often the more it's exposed to ultraviolet - it also darkens with repeated applications - been my favorite wood finish for decades
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics