In a class, I was told that the "pores" of the pan expanded as the pan heated and then, when you add the oil, it would get into the pores and create a more even coating to prevent sticking. Sounded good at the time 
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Emily
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"If you are not killing plants, you are not really stretching yourself as a gardener." -- J. C. Raulston, American Horticulturist |