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How to Spot Blown Double Glazing Repairs No matter how new your double glazing may be, it's not indestructible. It's likely to fail, and you should get it repaired when it fails. Misting is one of the first indications that your double-glazed windows are failing. It means that the seal between two panes has failed, which results in a window that is no longer as effective at insulating. Damaged Seals If a window seal fails, moisture can get between the panes of glass and cause fogging or condensation. Th