Anyone get under their vehicle and spray anything to help protect from rust? What's your process and product?

This is a question for Coonman.

I had my truck sprayed with fluid film.

I spray woolwax and fluid film on mine once a year, seems to keep the rust away. FF seems to be better in the doors tailgate inside frame as it creeps good and is thinner , WW is heavier doesn't creep as much or wash off as easy.

back in the '70's Had a buddy whose whole family would spray the undersides, in the doors, back of fenders and anywhere else rust would form with waste oil.
After filling with waste oil the process was to drive down gravel roads and the dust would stick to the oil.

It was a one time deal, the car would be good for years after that.

His Dad drove a '63 Catalina that had been done years ago, no rust on it after over decade of Wisconsin winters and the thick salt they used back then. This was unheard of back then.

Anyone who lived back then remembers how bad the rust was. It was extremely rare to see a car older than 5 years without rust holes. If you did it was cause it was never driven in the winters.

Fluid film may work fine, I doubt it will work as good as waste oil.

Fluid film in doors, rocker panels, wheel wells, tailgate. 2011 ram that never sees a garage. No rust yet.

I have a 2007 dodge ram 3/4 ton. Have had it oiled with krown rust proofing every summer, There is no rust. Cost 130..00 can. Lot cheaper than replacing the veicle. old 243

I use oil and one of those automotive brushes.

As for behind the fenders, I take out the tailights & shoot a good stream of oil in there. Sometimes that oil needs to be thinned 1st.

I have rubbed grease on the wheel wells.

I wax the paint once or twice/year.

Remove all plastic plugs on the underside of both rockers and fill with Fluid Film…then reinstall plugs. Spray the entire under carriage…Fluid Film will not attack rubber bushings as bad as waste oil. Spray on the back side of the bumpers….spray in that little drain hole in all doors ..and the last place…that everyone forgets,is to let the spare tire down and spray uo there

I hit inside the tailgate too, as it seems to keep the bottom of it from rusting.

The body, under the driver door, seems to harbor a lot of rust. It's not always an easy spot to oil. I think that side gets rustier since it is nearer the center line.

Used motor oil. Apply with a cheap sandblast gun and compressor.

PB Blaster - Surface Shield

That is all the people need to know....

Be careful with used motor oil. It is a known carcinogen. Unless cancer doesn't scare you.

My mechanic used ot use automatic transmission fluid with fuel oil. He recommended 3 times a year, my 2004 and 1997 never rusted until the next owner. Now he used the Fluid film once a year. My S-10 is a '99 with no rust. Oh I have 2 vehicles one highway one a 2019 and the S-10 for more local use......jk

X2
I have used the waste motor oil in the past, then graduated to fluid film. Now, I prefer this PB Blaster product which has essentially the same ingredients as fluid film. However, it seems to have a couple advantages. The nozzle sprays a much better, more uniform pattern and it now comes in black. That black color helps a lot with ensuring I get coverage without missing any little spots. Any of the above mentioned products are better than nothing at all.

Fluid film here on anything that doesn’t get hot

I just used Fluid Film last autumn. I'm determined to keep my new truck rust free for as long as possible.

Fluid Film is awesome. It's non-toxic and I think it smells good. I'm so pleased with the stuff I'm now using it all over the place. It's working great on some of the equipment and machinery I keep in my detached garage/barn/workshop.

I bought a gallon of Fluid Film and a sprayer made specifically for it. I used less than 1/2 gallon on my first application so I should have more than enough left for a second application this coming autumn. Even with the cost of the spray gun, that makes it less costly than paying someone else to do it. And I believe I have superior product and I know it was done thoroughly.

With winter approaching, I try to oil as many rusty spots as possible. Some spots I grease, although oil seems to creep better

Waxing before winter is important too

Yes sir!

Every fall I crawl under my truck and spray anything that looks close to rust with either spray paint or fluid film. I haven't noticed the fluid film any better but it's a more neutral color and can get it into smaller cracks it seems.

Do it every year....Not a once and done, kind of thing. Especially around here in the land of salt.