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How to Repair a Cracked Composite Door Although composite doors are extremely sturdy, they may be susceptible to cracks that are caused by general wear and tear. These cracks are usually simple to repair. All you need to do is apply an adhesive for plastic and a uPVC friendly cleaning agent (HG uPVC powerful cleaner is ideal). You'll also require a medium or fine grit Sandpaper. First, you must clean the crack. Identifying the Crack Composite doors are a common choice for front doors due to their