Rust remediation prep question. What kind of primer should I use?

[u/RandyRandyrson]

I had a water leak from the hatch seal I peeled away in the picture. I want to paint to in order to stop the rust from spreading. Sand it down to get rid of the loose rust. Then I'm not really sure what to do. I have no experience. Hit it with naval jelly to strip it down or is that going over board? Could that damage the good paint? Just hit it with rust oleum rust converting primer? I love my vehicle. I know this isn't northeast rust, but it is mostly pristine and I want to try to keep it that way. Any help is appreciated.