So I did some research and found a chemist that said Krud Kutter Concrete Etcher was basically the same as SEM Rust Mort, and considerably cheaper. I tried the concrete etcher on my 71 Barracuda and was not that impressed. Bought some Rust Mort off Ebay for 25 bucks (quart). It is considerably stronger and immediately starting to turn my surface rust into a nice black oxide layer.
Experiment over - Rust Mort wins.
Experiment over - Rust Mort wins.
