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Hi, I have a yew bowl that I applied a tung oil finish to and it doesn't seem to be drying properly. It already had mineral oil in the wood. Could that be preventing the tung oil from drying to the point where it will achieve a luster ?
 

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I'm not sure if the mineral oil is interfering with the drying time of the tung oil but it would have been better if you had stripped and sanded it first. The tung oil needs to penetrate into the wood and the mineral oil has sealed the wood. Even though, tung oil is a very slow drying finish. If it is cool or damp where you are that alone would contribute to the oil not drying.

If you were starting with new unfinished wood it may take a week or more for the tung oil to dry for another coat. The best way to tell when tung oil is dry is to briskly rub the surface with a clean cloth and see if the tung oil smell rubs off on the rag. When there is no smell the finish is dry.
 
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