I am building a wake tower for my boat that is only used on fresh water lakes in N. TX. I already have some sched 40 2" outside diameter tubing, but it is carbon steel. I know most if not all commercially produced towers are either 6061 or 63 aluminum or stainless, but I want to know if this carbon steel will work for me. If I kept a good coat of paint on it? The entire tower will be welded air tight, only the outside will be exposed. Any opinions are appreicated.