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A lot would depend on how long you let the tung oil dry between the 5 coats. Tung oil is a very slow drying finish and may take weeks between coats. If you applied it quicker than that you might want to wait a month or so longer. The best way to tell if a coat of tung oil is dry enough for another coat is to briskly rub it with a clean cloth and see if the tung oil smell transfers to the rag. When there is no smell it is ready. If the finish isn't fully cured all the way through it is possible it may be affected by the paraffin oil.
