Need to replace a small section of green board outside my shower
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I would use a strip of FRP (Fiberglass Reinforced Panel) to cover the area. It's used in commercial kitchens, freezers, and coolers. Will shed moisture and water. Glue it on with construction adhesive. Comes in white but can be painted. You can also get a strip of plastic laminate and glue that on to shed moisture and water. Also can be painted.
first check your drywall. water can spread like crazy in drywall. remove all the damaged drywall. treat for mold on your studs & floor before sealing it up. use FRP or check with your box store for what they recommend. install the new board. I would use an excellent waterproof paint to cover.
If you glue on a large panel, be sure to leave a few spots on the bottom open. This way if moisture gets in the wall, traveling from somewhere else, it can escaped through the bottom and not build up in the sheetrock behind the fiberglass panel (MOLD!). It won't even be visible, just a few inches in your glue/adhesive line along the bottom.