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How to Repair a Crack in a Composite Door Composite doors can withstand a lot of wear and tear, however they are not resistant to cracks. Cracks in the surface are easily fixed. Follow the directions for mixing the filler compound specifically for composite doors. Spread it over the crack, and ensure it is in line with the surface. Fixing a hole in a Composite Door Composite doors are tough and long-lasting, yet they are not immune to damage. This can happen through wear and wear, physical damage or changes in temperature or humidit