Quote Originally Posted by HOTRODPAINT
Just be sure you do not bondo over areas that have not been neutralized somehow. Rust is an ongoing process. Brushing it off, but leaving little pits with orange or brown rust in them will not stop it.

Perhaps an etching primer would be best, then use a compatible body filler over the top of it.
I understand rust doesnt stop but doesnt the phosporic acid convert the rust to black oxide and it is no longer rust?