We had the vertical blinds identical to the type installed on patio doors put on the sliders (glass) that is in our lanai. Two blinds for 36 ft. They are the PVC type, textured, colored, and does not let light through when closed. However, they can be fully opened, or closed and tilted to block the sun but still see out. If you don't have glass though, probably not work as well since they would probably rattle in the wind. Water doesn't hurt them though.
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