Phosphoric acid is not the main ingredient. Evapotust uses a chelating agent as a active ingredient. It attacks the rust but not the good metal. Unlike acid that attacks all metal. It is biodegradable unlike acid that is not. This has been discussed on here before and actually has started off a fire storm of a thread.
Do the research.
Originally Posted by
6bt
Phosphoric acid is the main ingredient of evapo rust. Home Depot sells it in the paint section
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90 nickolson Bored and Stroked "The Good"
Big Bore 110 Pauter frame "The Bad"
90 Bored and Stroked “vey’s frame” "The Ugly"
110 JSC frame Bored and Stroked
flat track build. “Shop trike”
1974 original 90 X 2
1974 Original 70.