The exterior doors are hurricane rated and aluminum frame. I prepped the doors and repainted the first set with grill paint. I was not happy with the finish and decided to repaint the remaining doors with appliance paint. The appliance paint left a much better finish and I now want to repaint the grill painted doors. Can I just apply the a appliance paint over the fresh grill paint or do I need to remove the grill paint first or prep the doors somehow?