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How to Repair a Crack in a Composite Door Composite doors can withstand lots of wear and tear, but they aren't immune to cracks. Surface cracks can be repaired easily. Follow the directions for mixing the filler compound specifically for composite doors. Spread it over the crack, making sure it is completely filled and in line with the surface of the door panel. Fixing a Hole in a Composite Door Composite doors are strong and long-lasting, however they can still be damaged. Wear and