Thanks a lot guys, I think I got the right information to start!

Wow, Myosmith incredible post!

Just two last questions.

How do you prepare the edges of the area (the rusty one that's just cleaned from the rust-paint) where you want to paint? I mean, having the almost scraped off old paint underneath around the edges of the clean metal patch, can I apply primer on top of it?

And
Is there a specific type of paint that works best on metal and outdoor heavy use (rain, air etc)?