Favorite Rust Mort?

[11echo]

I've been re-doing my doors on my "project" and I have the doors gutted out. I've sanded and wire brushed but I still have that rust at the edges. I was watching a You-Tube thing on repairing mid-late 60's doors and the guy said to use a "rust mort" to deal with the rust. I've used a spray on rust mort a number of years ago ...wasn't all that impressed with it. ...SO anybody have some suggesting for a "good" rust mort? ...THX!