I stripped an oak table, then sanded with 60 grit sandpaper, then 120 grit, then 220 grit. Next, I bleached it and the following day I applied Wood Grain Filler, wiping it off with burlap. 2days latter I stained it with Minwax Natural Oil based stain. 2days after that, I applied Varethane oil based semi-gloss Polyurethane. It has been 10 days since and there are some areas that are still gummy to touch. Any info will be appreciated.
This could have been caused by a bad batch of Varethane, the finish wasn't fully mixed before application or a reaction with one of the other products used. Also if applied too thick or a second coat was applied before the first wasn't fully dry this can cause a soft finish. Usually the finish will harden with time.
If it is still soft and gummy you will have to strip it and start over with a different finish. Careful stripping could leave the stain intact.