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How to Repair a Cracked Composite Door Although composite doors are extremely robust, they may still develop cracks as a result of wear and tear. These cracks are usually easily repaired. All you have to do is use the plastic filler and UPC-friendly cleaning agent (HG uPVC powerful cleaner is ideal). You will also require medium or fine grit Sandpaper. First, you must clean the crack. Identifying the Crack Composite doors are a popular option for front doors due t