I made a small thing to hold 4 wine glasses on a wine bottle. Silly, but my wife wanted it.
I put BLO on it and let it dry 7 hours. Put a coat of MWO and let it dry over night. Put a 2nd coat on the next morning, and a third that evening. The BLO and first 2 coats dried nicely. The third is still a little tacky after 2 days! It has been raining constantly and my hygrometer says it is 60% inside. I can't imagine how the humidity would affect varnish drying, but who knows; certainly not me.
I have done this a few hundred times before and never had a problem. What is going on here?