Thanks for the help, some good info. Everything I've read about the chemical treatment says if the epoxy has acid in it it can react to the acid in the treatment if not properly neutralized. I ran across this video on YouTube that pretty much validates that. After looking at my rust pits in the daylight, they really don't look too bad, maybe just wire wheel or spot blasting first. I'm tempted to use a chemical under the bed rails because of inaccessibility.
https://youtu.be/-yA8q4K-_Bo