Best rust converters for surface rust
So I've been looking up rust converters and have read mixed reviews on here and elsewhere on most of them. Some people swear by POR15, others say to stay well away from it. My dad used the Rustolem Rust Reformer on his Bus and it appears to work quite well but seems a little too hard - like it might crack. Then there's the Eastwood ones I've heard mostly positive reviews on. Which ones work? What about the spray chemicals that are supposed to remove rust?
I want to do the floorpans and some hard to reach areas of my car then undercoat it. The whole floor is light surface rust. I want to stop it and keep it from turning into rot. Are there any better options? Media blasting?