I bought a cast iron pan, and did not realize it had been preseasoned (this is my first one!).   I washed with soap and hot water and thoroughly dried it, then coated with thin layer of vegetable oil and baked it (upside down, over foil) at 350 for one hour.   It came out SO sticky, and the reside was thick. When I touch it, the oil rolls into little flakes (although the cast iron is NOT flaking).   So, I scrubbed that out as best I could,did less oil this time, and tried again. It still came out sticky and thick.   I cooked in it, chicken, to try to use it, and it all stuck and burned in the bottom.   Do I need to just season it a few times? I think the seasoning isn't taking. I am so bummed I didn't realize it was pre-seasoned, or else I wouldn't have had all these issues!   HELP PLEASE!  
As another commenter asked, are you using store bought yeast or a sourdough starter? If you're using a starter, you can store it in the fridge, covered and then take it out a day or two in advance and give it feeds every 12 hours or less depending on its doubling speed. If its store bought yeast I wouldn't take the chance and would throw it out. 