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How to Repair a Cracked Composite Door Even though composite doors are extremely robust, they may still develop cracks due to general wear and tear. Fortunately, these cracks are generally simple to repair. All you need to do is use a plastic filler and a uPVC friendly cleaning agent (HG uPVC's powerful cleaner is ideal). You'll also require medium or fine grit Sandpaper. You need to first clean the crack. Identifying the Crack Composite doors are one of the most sought-after types of front doors in the ma