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How to Repair a Cracked Composite Door Although composite doors are extremely durable, they may still develop cracks due to wear and tear. These cracks are usually simple to repair. All you need to do is use an adhesive for plastic and a cleaner that is uPVC-friendly (HG uPVC powerful cleaner is the best choice). You'll also require a fine or medium grit sandpaper. First, you need to clean the crack. Identifying the Crack Composite doors are a popular choice for front doors due to their strength and aesth