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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. Fortunately cracks like this are generally easily repaired. All you need is the plastic filler, a uPVC friendly cleaning agent (HG uPVC Powerful Cleaner is a great choice) and some medium-to-fine grit Sandpaper. First, you need to clean the crack. Identifying the Crack Composite doors are one of the most sought-after types of front doors in the market due to thei