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How to Spot Blown Double Glazing Repairs It doesn't matter how old your double glazing system is, it could still fail. It can fail, and once it does you must fix it as quickly as possible. Misting is among the first signs that your double-glazed windows are failing. It is a sign that the seal between the two panes of glass has sprung a leak, which means that your window will no longer be as effective for insulation. Seals that have been damaged If a window seal fails, moisture can get between the glass