Try "rustmort" It's a phosphoric acid based converter I think. I can go check, but, get it sandblasted and then rinse with a ton of water. after that, apply rustmort with a brush or a windex bottle.
Rustmort is the best thing you can do after you triple rinse. It's all about flushing away every bit of it. Water doesn't hurt bare steel nearly as bad as any chemical in conjunction with water. Getting the calcium away is key, and water is the answer. I know it sounds stupid to dowse bare metal with water, but it really is the best thing. Those pits contain a lot calcium. getting them clean and then water with a hand wire brush and flood the driveway if you have to. that's the way to go. Lot's of good tips in this thread. I owned an autobody shop for 9 years, close to 18 years professional experience...
That is what I would do. treat bare metal with additional sandblasting, followed by dry scrubbing and air from a blow gun. You have to get the sand off the metal. Then a good epoxy primer(if you can find someone with old style lead based epoxy primer, you are good) Try some PPG DP-LF primer on all the bare metal, let it cure, then follow up with a build primer. That si the best way to get it to last. It's all about flushing with water and scrubbing. You have to get all the pockets of rust killed.
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