Hello,
I'm a newbie to this site, but I happened to see this post and I have a very similar problem. I'm rebuilding a 1953 chevy 1/2 ton and rust is my middle name these days. I was willed this truck by my son-in-law knowing nothing about it. It turns out to be a real rust bucket, so I bought a used cab that was in much better shape until I removed the windshield. I find I have significant rust through under the seals. I, also, have limited mig skills and this area has some compound shapes.
I was wondering if I could tack some pieces in behind the holes and then braze the holes closed.
If anyone has some experience with this technique, I would like to hear about it.
Thanks in advance for any suggestions.