Tung oil cures in these two ways: polymerization and oxidationWhat does polymerized do ?
Oxidation is easy to understand - exposure to oxygen (like many finishes)
Polymerization is a molecular process where the oil will form long chains of molecules as part of the curing process. This takes time. Lots of time, often measured in weeks. "Polymerized Tung Oil" is tung oil that has been treated (usually by heating) and has undergone this polymerization process already. This will vastly shorten the curing time of the oil.
With tung oil, you will want to keep the coats thin (to allow the oxidation process to occur) and don't rush the coats. Leave a full 24 hours for each coat to dry, then buff with steel wool to level it out before another coat. This way the finish will be strong and durable and you aren't recoating while the previous coat hasn't dried yet.


















































