stripping a patina Duster hood

^^ One place I have seen Ospho mentiond (warned) is Southern Polyurethanes. They warn about the effects that can come of it Only neutralize method I have seen is go back and wet it good sit awhile of NOT dry, rinse thoroughly with water. ( Be advised back in my school days I fluked Chemistry several time). I have read that some epoxy primers contain some type of acid and there is a reaction, sometimes delayed for months.

I painted a 62 Dart, a few years ago it had sat out in the 110 degree Tx weather forever, and the top side was down to surface rust sheetmetal and pitted. I sanded it best I could, even ran the big wire cup on the right angle grinder over it good. I wiped it down good with Ospho. I thought I neutralized the whole car , maybe NOT!?? Epoxy primed ( forget what brand), epoxy primed it high fill urethane, usual sand, block I sealed it and shot it with acrylic urethane single stage. About 6-8 months later, I noticed some small or tiny blems looked really like I had some dirt in the topcoat.
It might well have been a delayed ration to the Ospho. Dunno.
It was a $1000 more door, not destined to ever be perfect anyway.

Way back maybe 10-12 year ago, I had a 63 Dart, good amount of surface rust on the hood. I sanded and cleaned it best I could and wiped it good with Ospho. I dreid about a day. I never knew to neutralize the stuff. I was not ready to tackle its body work and just wanted to protect the hood from rust and I had NO epoxy primer that day and was not making a 100 mi trip after any. I shoot it with RustOleum!!!! Ha fter it cured, I noticed some small areas where the paint had '
wrinkled". But it was stuck on well. That hood sat outside for another 6-8 month before I decided to tackle its body work. That RustOleum was ON THERE> I could not hardly DA the damn stiff off even where it had wrinkled. Yes it had fabbed because that is what it is.

About 30 years ago, I had drug home a 64 Sport Fury. Lots of surface rust, we DA ed that sucked with in of a heart attach used the best PPG epoxy primer, all the usual steps about a year later I noticed signed that it wanted to rust some under all that!!!! Thats when I learned of Ospho.

Years ago I used some metal cleaner that was from DuPont. Not sure how well it killed rust, but seems like a nice product. Stupid expensive.

Every body guy I have ever talked about such metal cleaning, always said, stay away from any.

Damn if you do and damn if you don't???