Baking Stone smells like burning plastic
I preheated my baking stone up to 450 degrees for a loaf of bread (I got a used one from a trusting friend). It smarted smoking and smelling like burning plastic. When I looked at the stone there was a layer of liquid on top the stone that went away very quickly after I took it out of the oven. What is going on? What do I do to get rid of it?