rskev> The box was painted black over rust, so I started with Zip Strip paint remover. Then several times of spraying on Muratic acid, followed by Krud Kutter , a Must for Rust, rust remover. The nice thing about the Krud Kutter, a Must for Rust, is you don't rinse it off. Allow it to Sun dry or wipe it dry with old rags, it leaves some kind of coating that inhibits the part from quickly surface rusting again. It can be wire brushed and painted over. I intend to paint the box with Cast Blast, the box is supposed to be natural cast finish. The top cover (Aluminum), and the round front cover also (Aluminum) should be left natural.