Best way to fix this rust?

I used a rust treatment from NAPA, it came out well. In the first picture, I wire brushed (on a drill) the rust. Then in the 2nd pic I put a thin coating on, then another thin coat 15 minutes later. Then I took the last pic after it cured for a couple hours. I was impressed how it reacted with the rust.

clean rust1.jpg

close 1st coat.jpg

finished.jpg