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How to keep wooden window frame paintwork in good shape
Use quality paint whenever you repaint windows.
Expect to have to repaint your windows every second year.
In between, it may be necessary to retouch the paintwork.
If you use exterior primer before you paint, the paint will last 10 years or more. I painted a building 10 years ago with exterior behr primer and exterior behr paint and it still has not peeled.