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How to Fix a Black Composite Door Scratch Repair Composite doors are extremely durable and resistant to the elements, but they can still be damaged. Fortunately that the majority of minor issues with composite doors are simple to fix. For example, if the door colour has become dull or faded, a simple cleaning with sugar soap is all it takes to restore the original colour. You can also apply a touch-up pen, like this Konig kit to repair small scratches and blemishes on PVCu windows as well