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How to Fix a Black Composite Door Scratch Repair Composite doors are extremely durable and hardwearing however, like all exterior doors, they are susceptible to being damaged by the elements. Fortunately, the majority of minor issues with composite doors are simple to fix. If the colour of the door has faded, all it takes is a simple cleaning with sugar soap to bring back the original shade. You can also apply a touch-up pen, like this Konig kit to fix small scratches and blemishes on PVCu windows doo