Originally Posted by
Lightning Pilot
Phosphatizing alone is probably one of the best, phosphatizing under a good paint is better. The reason I recommend a coating that incorporates zinc phosphate is that I helped develop one of the few paints that would actually prevent rust from spreading once initiated.
That's very interesting. Must for Rust shows phosphoric acid as an ingredient on its MSDS, and it claims to be active in stopping and preventing rust. Would you guess there's a similar process involved? (Not sure if you can answer that. And chemistry is not my area.)
Also, and again I'm guessing, but it seemed like something one might not want around aluminum or brazing.
https://images.homedepot-static.com/...269bfd939d.pdf
https://images.homedepot-static.com/...eba9b71933.pdf