To make an old, rusty, non-sticky cast iron skillet sticky again, you need to season the skillet properly. Seasoning creates a natural non-stick surface by polymerizing oil onto the cast iron, forming a protective layer. Here's how you can do it:
Clean the skillet: Remove any rust, food residue, or previous seasoning by scrubbing the skillet with hot soapy water and a stiff brush. Rinse it thoroughly and pat dry with a towel.
Remove rust: If there is extensive rust, you can use steel wool or a scouring pad to gently scrub away the rust. Make sure to remove all the rust to ensure an even seasoning.
Preheat your oven: Set your oven to around 375°F to 400°F (190°C to 205°C). It's essential to use a low to medium heat to avoid damaging the skillet or the seasoning.
Apply a thin layer of oil: Use a high-smoke point oil like vegetable oil, flaxseed oil, or grapeseed oil. Avoid using low-smoke point oils like olive oil. Apply a thin, even layer of oil to the entire surface of the skillet, including the handle.
Wipe off excess oil: Use a clean paper towel or cloth to wipe off any excess oil. The skillet should look almost dry; you don't want pools of oil in the skillet.
Place the skillet in the oven: Put the skillet upside down in the oven on the top rack to catch any oil drips. Place a foil-lined baking sheet or aluminum foil on the lower rack to catch any potential drips.
Bake the skillet: Let the skillet bake in the oven for about an hour. This allows the oil to polymerize and form the non-stick layer.
Cool down: Turn off the oven and let the skillet cool down inside the oven. Avoid handling the skillet until it has cooled down completely.
Repeat the process: To achieve a more durable non-stick surface, repeat the seasoning process 2-3 more times. This will help build up the seasoning layer.
After seasoning your cast iron skillet, it should have a renewed non-stick surface. Keep in mind that it may take some time and regular use to develop a perfect non-stick coating. Continue cooking with oil or fat to maintain and improve the seasoning over time. Also, avoid using soap or harsh detergents for cleaning, as they can strip away the seasoning. Instead, clean the skillet with hot water and a brush, and dry it thoroughly after each use.