Coatings (Bitul and Blios #47 - Shulchan Aruch YD 103:5)
Rabbi Dovid Cohen
Coatings: Pot and pans (residue, always aino ben yomo, asui l'hishtamesh b'shefah, ain kavonoso levatel); Pre-seasoned cast iron pans; Styrofoam cups; Fruits and vegetables. See seforim by Rabbi Cohen at www.kashrushalacha.com