No pics today.
but anyone do this? use like triple expanding foam to fill in rust holes in old cars? I've heard alotta bad reports and see it done lots of times. My car's got a lot of rust holes. big ones, too big to even get good bondo over.
My approach's been to remove as much as possible with a wire brush, drench it in rust converter, coat it in paint or primer and fill the holes with 3x foam. easy to cut and shape and fill afterwards and solid enough. it's not ideal but seems like the best option. I tried welding panels over a few spots and riveting panels over spots but those see to wind up creating really brutal crevice corrosion in addition to the HAZ rusting faster, plus it sticks out and looks crappy (yea, way crappier than 3x foam, hard to believe, sure). mesh screen bondo is a mess and difficult to line up and get to stay put, and hasn't held up any better, just cost more and more difficult and less finished looking.
So I'm going for it. Not seeing much for alternates and the spots I did last year still look good.