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You can use MDO (medium density overlay) plywood. It's high grade exterior plywood and is made to be left exposed to the elements. It comes in various thicknesses from 3/8" to 3/4". It typically comes with at least 1 side primed and once you put 2 coats of exterior paint on, it will last longer than what you have now. Any lumber yard will carry it. Not sure about the big box stores.