Unless you constantly cook at low temps, forget about keeping seasoning on cast iron. High temps also destroys porcelain coatings. Easiest way to care for them is to scrape them down immediately after cooking while they're still hot, then heavy coat of fat during the cool down to keep them from rusting. I love cast iron cookware, but hate cast iron grates. While I don't condone grill marks, you can get a cast iron grill mark press if that's what you're after.