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Double Glazing Condensation Repair Kit Double glazing can give warmth and reduce noise pollution. When condensate or a mist forms between the glass panels, it's a sign the seal is failing. It can be repaired by drilling a hole and pumping or injecting an appropriate drying agent into the sealed unit. This will dry the inside of the window and applies an anti-fogging coating to prevent further moisture build-up. Replacement Gaskets As time passes, everything degrades and the same holds true for uPVC gaskets