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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, surface cracks are not difficult to fix. Follow the instructions for mixing the filler compound specifically for composite doors. Spread it over the crack, and ensure it is level with the surface. Repairing a hole in a Composite Door Composite doors are designed to be strong and long-lasting but, like anything else they can be damaged or even br