Painted the inside with 2 coats of oil based Rustoleum. A little bit of mineral spirits really helps get rid of brush strokes. The holes and corrosion from the stainless steel transducer bracket were wire brushed; covered with JB Weld, then clamped between two 3"x4"x1/4" 6061 aluminum, countersunk 10-32 SS machine screws hold the plates together. When the transducer mount is put back on there will be some substantial material to drill and tap.