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How to Repair a Cracked Composite Door Although composite doors are extremely robust but they are still susceptible to developing cracks as a result of wear and tear. These cracks are generally easy to repair. All you require is an plastic filler, a uPVC friendly cleaning agent (HG uPVC Powerful Cleaner is the best choice) and a few medium-to-fine grit sandpaper. First, you must clean the crack. Identifying the Crack Composite doors are one of the most sought-after types of front doors