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How to Fix a Black Composite Door Scratch Repair Composite doors are very durable and resistant to the elements, but they can still be damaged. Fortunately that the majority of minor composite door problems are easily fixed. If the color of the door has deteriorated and the door is stained, all it takes is a simple clean using sugar soap to bring back its original shade. You can also apply a touch-up pen, like this Konig kit to fix small blemishes and scratches on PVCu windows doors, composite do