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How to Fix a Black Composite Door Scratch Repair Composite doors are extremely robust and resistant to elements however, they can be damaged. Most minor problems with composite doors are easily fixed. If the color of the door has faded, all it takes is a simple clean using sugar soap to restore its original colour. You can make use of a touch-up pen, like the Konig kit, to repair small scratches or blemishes. Plastic Filler Composite doors are an excellent choice for anyone who wants to enhance the look