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How to Repair a Scratch on a Composite Door Although composite doors are built to be durable and withstand the elements, they can still be damaged due to general wear and tear. There are a few easy ways to repair a scratch on a composite door. Begin by washing the affected area using a mild detergent and warm water. Then, use an adhesive repair kit to fill in the scratch. Follow the directions carefully on the product. 1. Filler can be used to fill in the gaps Composite door