These oils often contain impurities or fats that can lead to a sticky surface if not applied and heated correctly. It polymerizes faster than most other oils, forming a hard, glossy finish very quickly.
Understanding Oil Polymerization for Cast Iron Seasoning
Coconut Oil: Virgin coconut oil is rich in lauric acid, which can contribute to brittle seasoning. Using an oil with a high smoke point is essential because you need to apply heat that is sufficient to drive off moisture and initiate this chemical reaction without the oil smoking excessively and creating a bitter taste.
Conversely, an oil with a high smoke point might not polymerize as effectively at lower temperatures. Canola Oil: A budget-friendly option that is widely available and performs reliably.
Understanding Polymerization: How Oil Forms a Durable Seasoning on Cast Iron
While the process itself is simple, the chemistry of the oil determines whether you create a slick, resilient coating or a sticky, patchy mess that flakes off during cooking. When oil is heated to a high temperature, its molecules break down and re-bond, forming a hard, durable plastic network.
More About What kind of oil to season cast iron
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