Rust Encapsulator Black Qt.
Product Review (submitted on October 14, 2013):
I have used many products over that last 30 years to handle rust issues, but this is my favorite. Clean the rusty metal, paint, and you have a great surface to leave or prep for additional work. I started using this on my cars, but have since used it all around the home. I recommend it to everyone and with few exceptions it is my go to rust product. The spray version in black work great also.