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How to Repair a Double Glazing Window Double glazing repairs are often better left to professionals as very specific tools are required. Professional repairs come with a warranty which you cannot get if you try it yourself. Common problems include discoloured UPVC frames misting between glass panes, and broken locks or handles. If you're experiencing any of these issues, it's probably the right time to schedule an repair to your double glazing. Broken Glass If a window pane breaks it is essential