A New Post has Been made to the thread [What stuff to use]
The Reply was:
Rust never sleeps! Remove all traces thoroughly with a grinder or wire wheel...then clean, dry, and seal the surface. "Os-pho" phosphoric acid 'converts' rust to a black oxide, and preps the metal well...but if there's more than just a bit, it will have to be removed first! I'm fairly certain 'Extend' is a version of this same stuff...but my old rx-4 coupe had rust come back thru two years after--so watch out! Primering over such treatments is not enough...unless, perhaps, you live in the desert...
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