Wax oil.

Ive experimented with many anti rust products while trying to keep rust at bay on a 72 yr old ship.
Hammerite was the clear winner over fertan, rustoleum and a whole other range of anti rust products.. but a few years back they removed whatever hammerite had that made it so good (lowering voc content of paints) and now its not that great.. Never waste your time using red oxide, and oil based undercoat is better than red oxide.. I really dont know why anyone even bothers to make that crap !
Best on rusty steel is real red lead paint by a long way, but the hard bit is finding the stuff, and no it has never been banned...
Waxoyle is supposed to repair itself when a stone takes a chunk off by slowly flowing and resealing... any good? couldnt say !
what about basic black underseal? Great for painting on welds as it hides the appaling bodge job underneath..lol

rappey wrote: what about basic black underseal? Great for painting on welds as it hides the appaling bodge job underneath..lol

Yes for floor panel sections. rockers and the like I use the Hammerite underseal with added Waxoyl but on my Celerio, being a new car, I went with Tetroseal as it has a claim to have excellent sound deadening qualities which believe me the Celerio needed and I found to be very effective.There was just about no protection underneath and in key areas elsewhere so every little stone sounded like a marble in a biscuit tin. Suzuki should be ashamed of themselves. .

lots of salty roads and winter with large temperature variations where i come from.
Most important in my opinion is that the car is clean and dry when you put your favorite stuff under there. And also repeat the process and check for wear once every couple of years or so. Clean your car often and do this and it will last.
All carbon steel will sooner or later rust and return to the nature so it depends on the maintenance how long it will last.

linseed oil, lanolin, tectyl, dinitrol and so on, many products and most of them is ok.

On a new car i would use the thicker stuff, and on an older car more thin and penetrating products.

Lanolin is supposed to be the bee's knees but try to find it and then once you do it's very expensive!

Kirkynut

I have tonnes of the stuff. It's a bit raw and doesn't tend to appreciate being introduced to vehicles, but I do have lots of it.

Lambert wrote: I have tonnes of the stuff. It's a bit raw and doesn't tend to appreciate being introduced to vehicles, but I do have lots of it.

Some do not like the smell of it..

Friend of mine built some extremely large speakers and found some info about sheep wool having the best sound dampening quality.
Filled the speakers with the white stuff. Ready built speakers for testing, and turned the volume up high with the woofers pumping air thru all the ports and channels inside the speakers.
After a while the room smelled just like a sheep farm. I like the smell as i grew up on a small sheep farm but my friend did not