Really good hair regimen- I think the no great post can be an exception, just low heat or non-excessive use. Maybe you first iron your hair every once and a while instead on everyday... If its not for you to completely cut of heat.
YOU seal with olive oil if u want a heavier sealant or coconut oil if you want a light one. It is crucial to your hair regimen that you are able to differentiate a moisturizing oil vs. sealing oil so you know when to use which ones.