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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. Luckily, these surface cracks are not difficult to fix. Use a filler compound specifically designed for composite doors and follow the directions on how to mix it up. Spread over the crack and ensure it is at a level with the surface. Repairing a hole in a Composite Door Composite doors are durable and long-lasting, but they can still be damaged. This can happen through wear and tear