I am restoring a 1971 cuda, and it has many pinholes in the lower cowl (upper part of firewall panel). This lower cowl area needs to be solid to keep water out of the interior of the car. I would prefer not to have to change this panel if I can avoid it.
I think I can cover most of the small holes with a body filler (but suggestions are welcomed). The worst part is where this lower cowl panel turns down from flat (it becomes the firewall) meets the upper cowl panel. There are some holes rusted at the intersection on the lower cowl.
I have cut some of the metal out and had planned to weld in new pieces. But now I'm thinking it might be better, and easier, to patch with some kind of glue in patch.
I have no experience with gluing panels, so any advice is appreciated.
See this for a picture of the upper cowl and lower cowl/firewall assembly.