About 80% of the vinyl coating on the exterior of the door was bubbled and cracked. Probably due to prolonged exposure to the sunlight. It was relatively easy to remove using a scraper. In the remaining areas the vinyl is still securely bonded to the metal and scraping doesn’t touch it. Heat gun creates a big gooey mess with lots left on the door. Liquid paint stripper has no effect. Is there an easier way to remove this vinyl covering?