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How to Repair a Cracked Composite Door Even though composite doors are extremely robust however, they can still develop cracks due to general wear and tear. Thankfully cracks caused by these are usually easily repaired. All you require is an plastic filler, a uPVC friendly cleaning agent (HG uPVC Powerful Cleaner is the best choice) and some medium to fine-grit Sandpaper. You need to first clean the crack. Identifying the Crack Composite doors are a popular choice for front doors due to their durability