this post was submitted on 13 Apr 2024
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There's a lot of answers here, but I don't think anyone said the magic words. To reseason cast iron, you need an oil high in poly-unsaturated fatty acids. Those are the kind that can chain together, and form a good polymer coating.
The thing that trips me up most about this subject is that 140 years ago, pork fat was very good for seasoning cast iron. Today, it isn't, because the composition of the fat has changed significantly.
The best seasoning coats will be thin, not appear or feel oily, give the pan a dark color slightly more glossy than an eggshell, and resist mild detergents, metal spatulas, and heat high enough to sear a steak on. If you have a layer of loose stuff in the pan, that's just a layer of gunk, and is probably adding some weird flavors to anything you cook.
In other words: Linseed.
Though I wouldn't go so far as to say "need". Linseed works much better, builds a nicer patina very quickly, but pretty much any fat works. In practice mine is getting seasoned with olive oil because that's what I have standing around in the kitchen.
Proper technique is much more important in practice: First and foremost heat empty, then add oil and fry, then clean, ideally without degreasing (boiling water and a spatula do wonders), then (if necessary) add a drop of oil and try to rub it off with kitchen tissue, then put back on the stove to dry and maybe polymerise a little. Always have that thin layer of oil otherwise the pan is going to rust.
You can have a perfect patina, if you don't heat up the pan before putting stuff in there things are still going to stick. You can have practically no patina, if you bring up just a single thin layer of any fat up to its smoke point and after that add oil (so the thing isn't completely dry) things aren't going to stick.
Be careful with linseed oil as it spontaneously combusts! My friend used it on something and left the rag in the garage, and it literally burnt their house down.
Not an issue once on the pan: Linseed oil oxidises quite quickly when exposed to air which is where the heat is coming from and it's certainly exposed to air on a pan, however, the pan is also an excellent heatsink and not flammable. Rags are a combination of even more exposure to oxygen (because the oil soaks into fibres and then has lots of surface area) combined with the rag being flammable, those are very specific circumstances. Bottles of the stuff also don't spontaneously combust in the fridge, they only spoil within a week or so (for culinary use, that is, it's still perfectly fine to season pans with it, and is still food-safe. Just starts to taste like ass quite quickly but that doesn't matter when you burn the stuff anyway)
But yes I should probably have mentioned that I flush my kitchen tissues when working with linseed oil.