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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. The majority of minor problems with composite doors are easily solved. For instance, if you notice that the door's colour has become dull, a simple clean using sugar soap is all it takes to restore the original shade. You can use a touch-up pen, such as the Konig kit, to repair small scratches or blemishes. Plastic Filler Composite doors are a great