When applying a header paint, there are many steps that one should follow. One of them being curing the header paint appropriately. So, after applying the coating, let it dry for about one hour. To ensure the paint has cured fully, heat cure at about 450 degrees F for an hour. It’s worth mentioning that the paint may emit harmless odor smoke during this process. When the first coat has completely cured, you can now apply another coat.