I'm familiar with cold galvanizing, which works fine over made welds. This stuff, however, appears not to contain zync which interferes with welding. They claim that it is made with a high concentration of stainless steel (chromium?) which gives it its conductivity and weldability. The advantage, supposedly, is that it can be applied before welding and that you can tack or spot weld through it without destroying its anticorrosive properties. I know; if it sounds too good to be true, it probably is. But if it really works, it would be a great way to combat rust formation on welds and surrounding metal in areas that can't be reached after the weld has been made.
Bob S.