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How to Spot Blown Double Glazing Repairs No matter how brand new your double glazing may be, it's not a guarantee of durability. It's susceptible to breaking, and once it does you must have it fixed as soon as possible. Double-glazed windows that leak are a sign of failing. It is a sign that the seal between the two panes of glass has sprung a leak, which means your window won't be as efficient in insulating. Damaged Seals If the window seal is damaged, moisture could enter between the two panes of glass a