I ruined my first cast iron skillet. Completely. Orange rust all over the cooking surface, like someone left it in the rain. I scrubbed it with steel wool, then stared at it and wondered if I should just throw it away.

I did not throw it away. Fifteen minutes later it was fine. Cast iron is weird like that — nearly impossible to destroy, but so easy to mess up if you do not know the rules.

Why cast iron rusts in the first place

Cast iron is just iron. Iron plus water plus oxygen equals rust. The only thing protecting your skillet is a thin layer of polymerized oil — seasoning. When that layer breaks down, the bare metal underneath is exposed. Leave it wet, scrub too hard, cook something acidic for too long — all of it can strip the seasoning.

The rust is not dangerous. It will not hurt you. But it tastes metallic and nothing will cook right on a rusty surface.

How to fix a rusty skillet (the easy way)

1. Scrub the rust off. Use steel wool, coarse salt, or a chainmail scrubber. Get it down to bare gray metal. It should look uniform — no orange spots.
2. Wash and dry immediately. Soap is fine here because you are about to re-season anyway. Dry with a towel, then put it on the stove over medium heat for three minutes to evaporate every last drop of water.
3. Oil it thin. Pour a teaspoon of vegetable oil or flaxseed oil into the warm skillet. Rub it all over — inside, outside, handle — with a paper towel. Then take a clean paper towel and wipe it off like you made a mistake. The layer should be so thin it barely looks oily.
4. Bake it upside down. Put the skillet in a cold oven, set it to 450°F, and let it bake for one hour. Put a sheet of foil on the rack below to catch drips. Turn the oven off and let the skillet cool inside.

That is one coat. For a skillet that was completely stripped, do this two or three times. I did two coats on mine and it has been slidey-egg perfect for two years.

I once left a wet sponge sitting in my skillet overnight. The next morning there was a perfect orange outline of the sponge. That was the day I learned: never leave cast iron wet, not even for an hour.

How to prevent rust forever

• Dry it on the stove after every wash. Towel drying is not enough — water hides in the pores.
• Rub a drop of oil on it before storing. Ten seconds of effort saves you an hour of re-seasoning.
• Do not soak it. If something is stuck, boil water in it and scrape with a wooden spatula.
• Avoid the dishwasher. I should not have to say this but I have seen things.