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Swirt, pre-polymerized tung oil is pure tung oil, just like boiled linseed oil is pure flax seed oil. As I mentioned, the company I used to buy from also sold the hardeners to add to the Tung oil they had pre-polymerized via processes, just as linseed/flax seed oil is treated to speed hardening, so it will take place in hours, rather than days.
As we know, there are products, like Fromby's and Watco [so called Danish Oil], that have thinners and resins added, making them just thinned polyurethanes. In other words, though you, initially described it as a drying product, your description went on, in the third paragraph, to properly describe how Tung oil hardens.
Finish experts throughout the U.S. describe the hardening process for both linseed oil and Tung oil as taking place by way of reaction with oxygen, rather than by way of evaporation of added solvents, or drying.
As we know, there are products, like Fromby's and Watco [so called Danish Oil], that have thinners and resins added, making them just thinned polyurethanes. In other words, though you, initially described it as a drying product, your description went on, in the third paragraph, to properly describe how Tung oil hardens.
Finish experts throughout the U.S. describe the hardening process for both linseed oil and Tung oil as taking place by way of reaction with oxygen, rather than by way of evaporation of added solvents, or drying.
