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How to Spot Blown s No matter how old your double glazing system is, it could still fail. It is susceptible to failure and you should get it repaired immediately if it fails. Misting is one of the first indications that your double glazed windows are failing. It shows that the seal between the two panes of glass has started to leak, meaning that the window will no longer be as efficient in insulating. Damaged Seals If a window seal is damaged, moisture could enter between the two glass panes and cause