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How to Repair a Double Glazing Window Repairs for double glazing are best left to experts, as they require specific tools. Professional repairs will also have a guarantee that you won't get from DIY. Common issues are discoloured UPVC frames, misting between glass panes, and broken handles or locks. If you have any of these issues, it's time to get in touch with a double glazing repair. Broken Glass If a window pane cracks it is crucial to repair it immediately. This will prevent the crack from spreading