Most new fishing boats feature pressurized livewells to minimize sloshing that can jostle and injure delicate baits. Many older boats have conventional wells, but you can pressurize them. Cut a plate of King StarBoard or clear acrylic to fit under the lip of the well opening.
Attach a padeye on top of the plate and loop a bungee cord through it, securing the two ends to a piece of wood that will extend across the top of the well. Add four small circular pieces of wood or King StarBoard in the corners to center it. Use weather seal around the edges to keep the well watertight. Insert the plate and twist the piece of wood to tighten the bungee. Now your well is pressurized.