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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. Fortunately, these cracks on the surface are not difficult to fix. Use a filler material specifically designed for composite doors and follow the directions on how to mix it up. Spread it over the crack and make sure it is in line with the surface. Fixing a Hole in a Composite Door Composite doors are strong and long-lasting, yet they are susceptible to damage. Wear and wear and tear