"Metal Ready"??? ... Been out of the paint game ,10 years. I was used to "Metal Etch" ,a nasty phosphorus acid based mild rust killer/ etching property for a D.T.M. / epoxy base of primer. (Color clear/ aggressive on body senses). Second ,the usual SEM products style "Rust -Mort",kills rust &seals black episode. It's all acidic,anything new?