There wasn't any need for any hostility or sarcasm. I was merely giving advice. I didn't read this thread or follow it at any point or was there to see your rust.

I agree POR is most likely the best rust treatment and is far more superior than most rust preventatives considering its past uses and successes. Just needs to be used sparingly and correctly in rust repair as does metal welding.

It sounds though as if you're going to try and combat this rust on this 300D it's going to be quite difficult at this point. I was just down this road with a car a few weeks ago and just scrapped it because I wasn't going to be able to keep up with the cancer.

I'd keep it and drive it till the rust gets bad and part it and sell it to the metal yard.