The cab was sand blasted and epoxy primed some time ago and this is one of the last areas that need fixing prior to cab metal work being completed. I think if I was to attempt to fill it with MIG welding I would likely blow more holes in it and make it worse. I can get behind some of it with a copper backing but not all of it. The metal fabrication is very tempting for the sake of learning more but to be honest Im really contemplating the filling it approach....I can't believe I said that. I told myself I would only apply a skim coat for final finish where needed but this is such a small area and it isn't like a thick patch of bondo on the exterior plus it is sandwiched between the rubber seal so that should provide some protection from exposure and trap it in place.
Thanks everyone, as usual this group knocked it out of the park with great options and comments. There is no way I could have got this far on the project without this forum!
