I've a couple of rust spots, presumably from stone chips, that i'd like to treat and touch up.
Recommendations for product/technique would be appreciated.
Rust spot treatment (car)
Mar 01, 2022
Last reply: 4 years ago
3 Replies
Acid. Apply until rust gone, wash off, dry, prime & paint. HCl is super fast, almost instant, but the metal rusts before it's dried off by itself, you've gotta move without delay. Citric is superslow. Phosphoric leaves a semistable black coating. While better than nothing, when you paint you should remove it, it's only semistable.
That's interesting, I tend to use phosphoric acid after electrolytic derusting and paint over that.I thought that's why car body shells had a phosphate bath.
See also "etch primer", ones for steel contain phosphoric acid.
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