Not trying to self promote, but actual waxoyl works pretty well if done correctly.
I did not feel this was noticeable on mine but I -only- did the frame/frame rails. I did not do any of the underside of the body with it.if you use the turpentine as a thinner in the wax oil your truck will smell for months
I heard of someone using used motor oil sprayed on the frame, etc for use in rust abatement. Thoughts?
I'm considering doing this. The waxoyl has long since been rubbed off by snow, mud, grass, etc. Remarkably my truck has no leaks and therefore no build up of protective sludge. Surface rust is beginning to take hold and I'd like to head it off. Spraying used oil seems like a potential solution so long as I keep it off the hot parts.