Answer for Exterior wood windows.

I don't know of a coating that won't require maintenance in the future. But, the time between repainting can be extended by using proper preparation techniques, a really good primer and paint.

Also, using a clear paintable caulking around the glass to the sash frame and the window frame to the house (siding or stucco) can extend the time before major peeling. This alone can get you another year.

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