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Misty Double Glazing Repair When the airtight seal securing the two panes together in a double-glazed window fails misty double glazing can occur. This allows moisture to enter the window, which reduces its insulation properties. Repairing your windows professionally is more cost effective than replacing the entire window. This will also allow you to prevent further damage and condensation issues. Seals The window seal (also known as a uPVC seal) is crucial to ensure that your double-glazed is in top cond