Coming in from left field here. If the repair is out of sight, have you considered JB WaterWeld epoxy? It can handle high pressure and up to 250F. I...
I'll echo j44ke here. I've done a lot of that sort of thing and I'll also wager the corrosion is way worse on the inside. I'm not saying don't try it...
Thanks Steve! That is exactly the kind of advice I was looking for. Can I use a Harris “50N” product? Are alloys standardized? It doesn’t look like I...