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Start with 15 seconds. If that doesn't melt the oil, heat it at 5-second intervals. You need the coconut oil hot enough to liquefy and activate the gelatin. It won't mix well if it's still in its solid form. You can also use equal parts of coconut oil and petroleum jelly. You may need to stir it a bit to make sure it's evenly melted.  Coconut oil is hydrating, while petroleum jelly helps seal in moisture.
Warm up 2 tablespoons (30 mL) of coconut oil in the microwave.