I used Metal Prep and Scotch-Brite. Some of the deep pits I used a pic. Even if there is any small amount of rust left it will be converted and inert. 5 years no issues.
Doug
Me too. Was taught that a long time ago.
What I use - from Google:
The shop I frequent uses Cromax products (formerly DuPont). 5717S etching solution and 5718S neutralizer. The 5717S is a concentrate that is diluted in water and scrubbed via Scotchbrite and rinsed off. The 5718S is then applied full strength and rinsed off.
