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How to Repair a Crack in a Composite Door Composite doors are resistant to wear and tear, but cracking is still possible. Cracks in the surface can be easily repaired. Use a filler material specifically designed for composite doors. Follow the directions on how to mix it up. Spread it over the crack, ensuring that it is fully filled and level with the surface of the door panel. How do you repair an opening in a door made of composite Composite doors are designed to be strong and long-lasting, but like every