This review just offers me numbers of rust prevention spray Best Rust Proofing Inhibitor Spray for Cars I was thinking to use Corrosion Inhibitor.
Did anyone here use it before? Is it a good idea to try it myself? What if I did not apply it properly? Any suggestions, please? Which one is right for my car?

 

Most cars today don't need it. What are areas that you are trying to protect?

 

The frame and the area around the license plate.

 

Unless you're planning on removing the body to do the frame, I would suggest using a product called POR which stands for paint over rust. It was listed in the article you referred to. You can get it from a company called Eastwood and probably other places also.