72 Dart frame rail repair?

kbr577 said

I have a 72 Dart with a rusty, holy left frame rail, master cylinder was leaking for a long time it seems.
I was wondering what everyone was using to fix it, the cap or something else.
Thanks!

Click to expand...

Pictures would be nice. It really depends on how widespread the rust is. For a small section just making a couple of patches may be more than enough. For a more widespread issue it might be better to replace the whole rail. With rust it’s usually a good plan to consider that there’s at least twice as much as you see.

The caps are kind of problematic, you still have to cut out all the rust and work back from clean metal. If you just throw a cap on over the rusty rail, it will continue to rust behind the cap and at some point that unseen rust will come back out and bite you.