Many boats, including my 1986 O'day 35, came with Plexiglass drop boards. Mine are smoked for privacy, but still allow some light in and you to see out.
They seem pretty strong and while I am sure they don't make a watertight seal they don't let rain in. My O'day has a good sized bridgedeck, so it would take a LARGE wave for water to reach the drop boards.
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY
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