I was wondering which metals hold up well in saltwater use. I know that stainless steel is popular. Brass has been a nautical mainstay for centuries. How does copper (like tubing) or aluminum hold up over prolonged marine use? I was thinking of using copper tubing (since I have a bunch on hand) and some aluminum for some projects on deck but don't want a corroded mess after one season. Any experiences/input would be appreciated before I create an expensive, short-lived mess.