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I've used quite a bit of 100% pure Tung Oil with fine results. Usually, I hang up the rag I used and when its stiff (the rag) I call it "dry". I do this with all the wipe ons. Based on my experience, it usually it takes between 16- 36 hours to get a stiff TO rag to dry.
I have noticed that when you wet sand a finish, the drying (stiff rag method) takes considerably longer. I've found this true with Oil/ Varnish and with TO. Does anyone know why this would be (a rag with oil dries 5X faster than a rag with oil+ saw dust slurry)?
Why I'm writing is that the my current TO project (8"X 12" box) has been drying for 7 days and the rag is still not stiff (which means the finish is still not "dry"). I want to apply my shellac!
I know that many of the fine posters here will say TO takes weeks/ months to dry, but that has not been my experience (except with the wet sanded method). My TO is fresh (or at least I just bought it from Rockler) but after 7 days, the cotton rag is still not dry. How do some of you determine if a TO finish is dry enough to overcoat with shellac?