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How to Repair a Cracked Composite Door Although composite doors are incredibly robust, they can still suffer from cracks caused by general wear and tear. These cracks are generally easily repaired. All you need to do is use an adhesive for plastic and a cleaner that is uPVC-friendly (HG uPVC's powerful cleaner is the best choice). You will also require a fine or medium grit Sandpaper. It is essential to first clean the crack. Identifying the Crack Composite doors are a popular choice