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How to Repair a Crack in a Composite Door Composite doors are able to withstand a lot of wear and tear, but they aren't resistant to cracks. Surface cracks are easily fixed. Use a filler material that is specifically made for composite doors. Follow the instructions on mixing it up. Spread it over the crack, making sure it is completely filled and in line with the surface of the door panel. How do I fix the hole in a door made of composite Composite doors are tough and long-l