Stopping Surface Rust

[oldtimer40]

rust converter is usually a form of phosphoric acid that when applied to rust goes through a chemcal reaction,converting the rust to iron phosphate (i think) which is chemically inert ie: not rusting.
once converted, rust preventative products ( fish oil,lanolin, primer and paint etc) are applied to prevent further rusting.

the trick is that there has to be some rust there for the chemical reaction to occur, so if you go wild with the sander or wire brush and remove ALL the rust then the converter has nothing to react with.

Thanks for that Missingdna,

It has been a while since I done any rust / body repairs. In the past, I used to do patch ups (i.e. Grind / Sand, apply rustkill, then 2 coats primer, sand again, then paint, etc).

At one time I had some really pungent smelling stuff I brought and applied by brush directly to rust as a short-cut fix because I was going to get back to it later, and the whole rusted area turned black, hardened and brittle looking... Is this the rust converter?