rust evaporator says eats only the rust, leaves clean metal

[waynekarnes]

anyone know anything about this stuff ?

 

http://www.evapo-rust.com/HowERworks.html

[steve72z]

Not sure about that product but similar products such as Rust Mort work the same way. They are a mild acid that attacks the rust. A friend of mine does high end muscle car restorations and uses these products in areas where the rust in not bad enough to warrant cutting in a new piece of metal. I have used the products myself several times with good results. The rust will actually turn and stay black. Keep that stuff away from paint though. I used it on my suburban and accidentally got some on the paint, left a nasty stain that I couldnt get out.