This is jkrueger's other half- thought I would step in with my 2 cents. Years ago when I did bodywork I found a product called Duro Extend rust treatment that somehow chemically bonded with the oxidation to form a polymer coating over the rust and seal it. You had to knock all the loose rust off (stiff wire wheel on a grinder or drill), then brush the material on- it goes on like milk (it was latex-based) and when it works properly it turns black. I was able to bondo over it, prime it and paint with good long-term results.
I thought that might be good to use in this application, but figured we should check in with this forum first. This stuff has been around for years, and certainly there must have been newer/better/safer things developed. From the descriptions, it looks the the SEM Rust Mort might be the same material. Anybody know if it's different?
I gotta do something before March or so, or it will be another year!
