Powder coating doesn't work any better on things that flex such as tower legs and t-tops. I have found it to be very long last on aluminum that doesn't flex such as engine room louvres, salon doors and things like that. I think the flexing will knock anything off eventually.
Boat is still high and dry at the marina where I can't get to it. It goes in the water May 1st and then I will be able to start my projects. The marina won't let you work on your boat.....hmmmm. They claim for liability reasons but I think they just want to do the work for you. I will take before and after pictures and post the results. I am thinking that the Interlux paint is the way to go. They have some really good YouTube videos showing how to properly prep and apply the paint. It looks pretty easy as long as you use the right tools and take your time.