Very interesting reading about waxoyl/spirit/zinc etc etc , i've applied it myself and had it applied "properly" at a garage and noticed my chassis continuing to rust and the wax peel away,it seems to encourage water retention where it flakes off, even although chassis scrubbed and deflaked. i have also red leaded one lorry chassis , used oil and soot mixtures, rubberised chip spray, and nothing has worked. I ran out of ideas. I have a new (er) landrover now and have been back reading all the posts on the various treatments and conflicting advice. Finally today I phoned a guy who sprays and has done, does, this stuff for a living and he told me it was all a complete waste of time, rust will still come at the same rate whatever is used and to just give up and accept it , the treatments just hide it. He suggested perhaps use "Shutz" the black sooty stuff to make the underside look pretty at least while it slowly rusts away at the same rate . It appears that a full galvanised chassis is the only expensive answer. I have decided just not to bother now, keep my clothes and face, hair and eyes clean and keep the cash. (Love to hear of any new treatments that might work apart from the ones I mentioned though).
I have heard mention of some electronic device you attach to the chassis made in USA that prevents the chemical reaction from happening ???