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How to Fix a Black Composite Door Scratch Repair Composite doors are very robust and resistant to elements, but they can still be damaged. Fortunately most minor issues with composite doors are easily fixed. If the color of the door has deteriorated the only thing you need to do is a quick clean with sugar soap to bring back the original shade. You can make use of an eraser pen, such as the Konig kit, to fix small scratches or blemishes. Plastic Filler Composite doors are a great option for anyone