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How to Repair Double Glazing Double glazed windows are long-lasting and secure, but they will wear and tear over time. Double glazing that needs repair can be identified by the feeling of draught between the window panes or condensation. Condensation or fogging between the panes typically indicates that the seal holding the glass panes has been broken. This can be fixed by a reseal. Seals Seals are an essential component of double glazing as they improve the energy efficiency and insulation of the windows.