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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 aren't immune to cracks. Cracks in the surface can be easily repaired. 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 in and at a level with the surface of the door panel. How to repair the hole in a composite door Composite doors are strong and long-lasting, however they are s