I'm not sure if this has ever been posted before. I found it while researching which rust inhibitor to buy when i do my rocker panels. It compares Rust Bullet, POR-15 and Eastwood Rust Encapsulator. I thought this might help someone out who is also stuck on which to buy. I did not perform this test myself, I am simply passing on someone else's results.
http://www.drjing.com/Mini/BLOG/SideBySide.htm
http://www.drjing.com/Mini/BLOG/SideBySide.htm