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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 easy to fix. If the colour of the door has changed the only thing you need to do is a simple clean using sugar soap to bring back the original shade. You can also make use of a touch-up pen like this Konig kit to repair small blemishes and scratches on PVCu windows, doors and composite doo