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How to Spot Blown Double Glazing Repairs It doesn't matter how old your double glazing system is, it can still fail. It can fail and, if it does, you need to fix it as quickly as you can. Double glazed windows that mist are a sign of a failure. It indicates that the seal between the two panes has failed, resulting in windows that are no longer as effective at insulating. Seals that are damaged If the window seal fails, moisture may enter between the two panes of glass and cause condensation or fogging. T