Holden use a special adhesive to join the front firewall to the rest of the body so it must be good stuff, Its not a major structural area but it is glued on. If it was origionaly a welded section I would reweld it and then coat it with a rust preventative. A good panelbeater will not put a plate behind or over a rust hole he will always cut the area out and replace it with a similar size and thickness panel "BUTT" welded and ground down so that minimal body filler is used.
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