That big time rust you guys are dealing with! I’ve used Naval jelly I know but it works on the rust I deal with just small areas. Also Pour it comes in a quart can and does great on frame work, paint it right over the rust. Just had a few spots on my 55 frame. Jacked the rust and made a smooth surface I used a wire wheel and brush cleaned the area did use Naval Jelly on the area below the battery stick location. Just installed a NAPA Legone battery it’s sealed. AJ