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Old 05-09-2021, 10:13 AM   #1
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Chassis Rust

I crawled under my new 5th wheel today for some maintenance and found some places with superficial rust (see pics). FWIW we got it in February and it was moved on very salty roads to the dealership.

Should I just spray it with Fluid Film or other coating? Or do I need to put rust conversion on it first?
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Old 05-09-2021, 10:21 AM   #2
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I would clean all rusty spots with a rag then spray Fluid Film on all the rusty areas.
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Old 05-09-2021, 01:51 PM   #3
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I touch up mine with Rustoleum black satin spray paint.
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Old 05-09-2021, 01:58 PM   #4
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I'm going with treat the rust with rust converter (phosphoric acid) and then paint, but with brush on Rustoleum like this: https://www.lowes.com/pd/Rust-Oleum-...9&gclsrc=3p.ds


Brush on is so much neater that spray paint and you get a lot more for your money. Use cheap disposable brush. Good luck.
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Old 05-09-2021, 02:04 PM   #5
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That looks like really minor superficial rust. You can just wire brush and really loose flaky or bubbly rust by hand and apply Fluid Film, it'll do its job. Keep the area lightly wet by reapplying as needed, likely once a year, maybe less depending on use.
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Old 05-09-2021, 02:06 PM   #6
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Just hit it with some Rust-Oleum every couple years. That surface rust is no big deal.
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Old 05-09-2021, 05:36 PM   #7
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paint the entire frame that is exposed with a spray can that has rust converter / rusty metal point. your only going to chase spots each year . the factory paint is thin and is the real cause of the surface rust.
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Old 05-09-2021, 07:18 PM   #8
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Thanks folks, good advice here
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Old 05-09-2021, 07:25 PM   #9
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If you want to do it once and forget about it, check out POR 15 products. Based on the advice I've been given, they're more effective than Rustoleum and similar products. The initial cost is higher but not in the long run. POR 15 is highly regarded in the auto restoration community and was recommended to me by a former body shop owner.

https://por15.com/collections/all?ut...RoCTlcQAvD_BwE
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Old 05-09-2021, 08:40 PM   #10
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If you want to do it once and forget about it, check out POR 15 products. Based on the advice I've been given, they're more effective than Rustoleum and similar products. The initial cost is higher but not in the long run. POR 15 is highly regarded in the auto restoration community and was recommended to me by a former body shop owner.

https://por15.com/collections/all?ut...RoCTlcQAvD_BwE
Ive used por15 and the surface has to be prepared properly. The stuff is tough, but it does not stick well to a smooth surface
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Old 05-09-2021, 10:33 PM   #11
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Ive used por15 and the surface has to be prepared properly. The stuff is tough, but it does not stick well to a smooth surface
It's best to use their cleaner, followed by their metal prep rust neutralizer/etching solution. Just follow their instructions and you'll be fine.
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Old 05-10-2021, 07:22 AM   #12
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I personally would hit it a couple times a year (spring & fall) with WD-40 & be done with it. I have watched a few videos of WD-40 compared to Fluid Film & WD-40 has nearly the same rust protection as the Fluid Film. And for the price difference you can spray the underneath of your vehicle 3 or 4 times for the price of the Fluid film. I buy the WD-40 in the gallon jug at Lowe's for $20 & use a spray bottle that I purchase from them as well. I do all of my vehicles late fall before the winter salt & spring after I wash the underneath real well to get any lingering salt off from winter. Frame of my 4 year old truck still looks like it did when I got it new.
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Old 05-10-2021, 07:54 AM   #13
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I personally would hit it a couple times a year (spring & fall) with WD-40 & be done with it. I have watched a few videos of WD-40 compared to Fluid Film & WD-40 has nearly the same rust protection as the Fluid Film. And for the price difference you can spray the underneath of your vehicle 3 or 4 times for the price of the Fluid film. I buy the WD-40 in the gallon jug at Lowe's for $20 & use a spray bottle that I purchase from them as well. I do all of my vehicles late fall before the winter salt & spring after I wash the underneath real well to get any lingering salt off from winter. Frame of my 4 year old truck still looks like it did when I got it new.
There is NO way WD-40 does the same job as Fluid film. WD-40 displaces water and does almost nothing to prevent rust. It has almost zero oil base.

I've been using Fluid Film for over 20 years, so I know the stuff pretty well. Nothing is perfect, but it's the best overall product I've found so far.
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Old 05-10-2021, 09:34 AM   #14
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I agree, rust-oleum and WD40 are useless. In fact most spray can paints will do little to prevent future rust in this application. I don't know about the other recommendations above.

I use a high quality chromate primer followed by a industrial quality enamel top coat. The primer adheres and blocks rust. The enamal provides a long lasting color coat.

Rust and dirt must be removed prior to application. Doing this when new and rust limited is easier than later.

I use this treatment on all new plated hardware when I bring a new trailer home. Little rust removal is required at that time. I also use it on steel under neath until I run out of ambition. My current 3 year old TT is half done underneath, and the difference is obvious.

I wish you good luck and happy trails ahead!
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