Hello, I have a tandom axle trailer that gets dipped in saltwater every weekend. So the axles, leaf springs and other suspension components are pretty rusty. I wanted to paint them, but did know what kind of paint to use? Especially on the leafs, since they are constantly flexing, I would need a flexible paint. I tried Por 15 (a restoration paint), but that only lasted a year. Also, since I am taking off all the components to do this and make it easier, would you recommend replaces the bushings or anything like that? It's a 1987 trailer and I want it to be reliable on long trips.