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Re: Slow down rust?
I like those products listed above, but wet salty winter road spray can and does overcome those products over time.............its happened to me........... if something quick, cheap and dirty is required, try this:
I have had great success using a professional-grade oil underspray product, that I get in 4 liter jugs. When sprayed on it has the consistency of motor oil, but has a solvent in it that evaporates, so it sets up a bit thicker than gear oil. Over time, dust/dirt sticks to it forming a messy but very effective greasy layer.
Just be sure to scrape or brush off the worst of the loose/flaking rust first.
A pump-up garden type sprayer with a wand does fine for the application, and can get into pretty tight places.
I have also sprayed on an ATF/gear oil blend that does much the same thing.
Just reapply it every fall. It usually takes me 30 minutes to thoroughly treat the underside of my truck.
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