67 barracuda notch back window rust repair

Bringing back an older post I started with a new idea to hold over my rust issue. What is everyone’s thoughts about using a rust converter or some other topical rust stopper until I’m able to cut and repair the metal. I just don’t want it to get any worse and this seems like a good option until I can get to it to do it right. Thanks for everyone’s input!
I wouldn't worry about it if you can keep it dry. If not, get that vinyl off and use por-15