Nice man, gave me an idea. Rust is a bitch, I just sanded back my hole boot due to rust and put a few coats of wattyl rust-kill primer. Turned out smick, thinking of doing what you have done and kill the rust.
Personally I would of treated the rust before painting it, as the rust will most likely reappear.
Personally I would of treated the rust before painting it, as the rust will most likely reappear.