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How to Spot Blown Double Glazing Repairs No matter how old your double glazing system is, it could still fail. It is susceptible to failure, and once it does you must fix it as quickly as possible. Double glazed windows that mist are a sign of a failure. It shows that the seal between the two glass panes has begun to leak, which means that your window won't be as effective for insulation. Damaged Seals When a window seal is damaged, moisture may get in between two glass panes and cause fogging or condensa