Wow! I picked up a bottle of that naval jelly stuff, its amazing! I was too lazy to deal with OA on this bike, since it was a dumpster find and I just wanted to get it on the road, and I didn't care too much if the paint was kept intact, so I figured I'd give it a try. I didn't even have to let it sit on the recommended 5-10 minutes, the rust started brushing off almost instantly, with no obvious damage to the paint

Before:



After:




I only applied it to that big area of rust, there's still some spots that I'm going to have to return to