Next, wire brush, sand (60 grit), grind the surfaces. If I can't get the loose paint off with the brush or paper I just grind. You can see some of the really tight areas with rust, I just do the best i can with them. This is not a factory finish. You can continue sanding with finer grit if you want to, the more prep the better the end result will be.
The reigning Mayor of Stupidville