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How to Fix a Black Composite Door Scratch Repair Composite doors are extremely durable and tough, but like all external doors they can be damaged by the elements. Fortunately most minor composite door problems are simple to fix. For instance, if the color of the door has become dull, a simple clean using sugar soap is all that is required to restore the original hue. You can also use a touch-up pen such as this Konig kit to repair small blemishes and scratches on PVCu w