Maybe you need to re-season it. I re-season mine couple times a year when I can open the windows. Just recently, though I purchased a "Green" that I can use in the oven as well. That one also has to be seasoned. It said to use vegetable "oil" but I have always used vegetable "shortening" such as Crisco. That way it is easy to coat before seasoning in the oven. I usually put it in a preheated oven between 400-500 degrees for an hour. After that I let it cool completely then wipe out the excess really well with a clean damp to dry dish rag. When food starts to stick, it's usually time to re-season and that would be about every 3-6 months depending on how often you use it.