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How to Repair a Scratch on a Composite Door Although composite doors are built to last and resist the elements, they can be damaged by general wear and tear. There are a few easy ways to repair a scratch on the surface of a composite door. Start by cleaning the area with a mild detergent, and warm water. Then, you can use a composite repair kit to fill in the scratches. Follow the instructions on the product with care. 1. Filler can be applied A composite door is a well-known front or back door that is cons