Lower units were polished with Jewelers rouge. The polished surface was thought to be more resistant to corrosion. Drive shafts and prop shafts were “Parkerized” to prevent rust. They later switched to stainless steel. The turn plate material used to stamp out the fuel tanks were treated to resist corrosion. Cast iron was always a problem.Several different paints were tried, and at one point the cylinders were copper plated. More brass was used in the “Salt Water” motors, and some parts were nickel plated. Dad showed me a set of Super C cylinders that were done with a glassy black baked enamel finish with nickel plated ends polished to a mirror shine. They were used at the New York Boat Show.
