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Misty Double Glazing Repair If the airtight seal that holds the two panes of a double-glazed window fails misty double glazing may occur. This allows moisture to get into the window, which reduces its insulating properties. It can be cheaper to have your windows repaired professionally rather than replacing the entire window. This can ensure that you don't suffer further damage or condensation problems. Seals The window seal (also called a uPVC seal) is vital to ensure that your double glazing