I tore off my heat shields today because they were rattling so bad. When I took the long one off, it put a small hole (half a penny size or less) in my exhaust. I have never welded or own a welder. I tried to also j/b weld the hole and it just melted off. I have patched headers with this stuff before but not such a big hole. Will this work? Is my only option to weld?