Hi, mj1. You could try heating it up to 350 F again nad leaving it in the oven for an hour or more. If that doesn;t work, you'll have to cook off the sticky mess and start over. I use my gas grill for that. Turn it on full blast with pan inside and let it burn off all the crud. You end up with a brand new unseasoned pan.
To start over, coat the pan all over (both sides) with shortening (very little) and put it into a 350 F oven for an hour. Then turn off the oven and leave the pan in to cool down.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan