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How to Fix a Black Composite Door Scratch Repair Composite doors are extremely durable and hardwearing, but like all external doors, they can be damaged by the elements. Fortunately, the majority of minor composite door problems are easy to fix. If the colour of the door has changed the only thing you need to do is a simple cleaning with sugar soap to restore the original shade. You can use a touch-up pen, such as the Konig kit, to fix small scratches or blemishes. Plastic Filler Composite doors are