It's generally not recommended to flat iron your hair immediately after applying coconut oil. Coconut oil is a natural oil that can provide some protection and nourishment to your hair, but it can also make your hair more susceptible to heat damage.
When you apply oil to your hair, it can create a barrier that slows down heat transfer, which can cause the flat iron to work harder to achieve the desired result. This can lead to higher heat exposure and potentially cause damage to your hair.
If you plan to flat iron your hair after applying coconut oil, it's best to wait at least 30 minutes to allow the oil to absorb into your hair before using heat styling tools. This will help reduce the risk of heat damage and allow the oil to provide some protection and nourishment to your hair.
Alternatively, you can use heat protectant products specifically designed for use with heat styling tools. These products can help protect your hair from heat damage and provide a smooth, sleek finish without causing harm to your hair.