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Misting Between Window Panes: Why an Exterior Coating Is Not the First Decision

First establish where window misting is located. Condensation between panes raises a glazing-unit question that an exterior surface coating cannot resolve simply by changing the outside face's water behaviour.

Updated · NANOLAB Knowledge

The key distinction

Pilkington distinguishes condensation on the room side, outside face and between panes, with different causes and responses. If the moisture is within the insulated unit, the glazing supplier should assess the assembly. Keep the distinction clear in a coating consultation so the customer is not sold a surface treatment as a remedy for an inaccessible internal condition.

Practical checks

  1. Observe the misting without unsafe access and note which accessible face can be cleaned or dried under the care instructions.
  2. Record when it appears, the affected panes and any relevant glazing information.
  3. Ask a qualified glazing provider to assess suspected internal condensation before discussing optional exterior surface care.

Example

Illustrative example: a homeowner requests a nano coating because a double-glazed pane remains cloudy after both accessible faces are cleaned. The next useful step is to locate the cloudiness and assess the glazing unit, not to promise that exterior repellency will clear the cavity.

Scope and limits

Do not open, drill or alter an insulated glazing unit as part of a cosmetic coating service. The cited guidance is not a diagnosis of a particular window. Any repair or replacement decision should follow the glazing provider's assessment and applicable product information.

Related guidance

Technical references: Pilkington window condensation guidance. These sources describe their stated methods or products; they do not certify NANOLAB products or establish compatibility with an unlisted surface.

Discuss the intended surface with NANOLAB. Use the current product documentation for formulation-specific instructions.