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How to Repair a Crack in a Composite Door Composite doors are resistant to wear and tear, however cracking is still possible. Fortunately, surface cracks are simple to repair. Make use of a filler that is specifically made for composite doors. Follow the instructions on how to mix it up. Spread it over the crack, making sure it is completely filled in and at a level with the surface of the door panel. How do you fix an opening in a composite door Composite doors are designed to be strong and durable, ho