bay and my rust was just like yours! To fix this I used a circular wire brush that attaches to a drill and grinded a lot of the rust down, after that I used a product called rust converter. You can get this stuff at auto zone, it converts rust into a black primer that can be painted after 3-4 days. I posted a few weeks ago, look on my post history and you might find some pix of the b4 and after of the rust. Hope this helps.