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How to Fix a Black Composite Door Scratch Repair Composite doors are extremely durable and hardwearing However, as with all external doors, they can be damaged by the elements. Fortunately most minor issues with composite doors are easily fixed. If the colour of the door has faded and the door is stained, all it takes is a simple cleaning with sugar soap to bring back the original shade. You can also use a touch-up pen such as this Konig kit to fix small scratches and blemishes that are present on PVCu