A long time

Clean the entire surface of the window before staining. It should be completely dry. It is not recommended to color the window that the straight rays of the sun fell on for a long time. Staining in the evening is not desirable. Dew can destroy the top layer of paint. The most suitable day is warm and cloud, and humidity should not be more than 80 percent. The room must be cleaned of dust so that it does not settle for paint.