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05-09-2021, 10:13 AM
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#1
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Senior Member
Join Date: Apr 2019
Location: Fort Collins, CO
Posts: 308
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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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2021 F350 Lariat SRW Diesel, 2021 Alliance Paradigm 310RL 5th Wheel, Superglide Hitch, 380W Solar, Onan 5500 Propane Genset
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05-09-2021, 10:21 AM
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#2
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Senior Member
Join Date: Sep 2012
Location: Palm Coast Florida
Posts: 12,995
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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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05-09-2021, 01:51 PM
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#3
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Senior Member
Join Date: Dec 2015
Location: Rossville, TN
Posts: 407
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I touch up mine with Rustoleum black satin spray paint.
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05-09-2021, 01:58 PM
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#4
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Senior Member
Join Date: Mar 2019
Location: Lansing MI
Posts: 2,811
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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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An Old Fisherman
2017 Nexus Ghost 36DS, 2014 Ford F150 Long Bed
2007 Harley-Davidson Ultra Classic
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05-09-2021, 02:04 PM
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#5
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Senior Member
Join Date: Mar 2019
Posts: 2,951
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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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2011 GMC Sierra 3500HD gas 6.0 dually
1994 K1500 Suburban shop mule and plow truck
2006 Lakota 29RKT 5th wheel
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05-09-2021, 02:06 PM
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#6
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Senior Member
Join Date: Aug 2013
Location: Northeastern Nebraska
Posts: 969
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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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06 forest river Cardinal 34 TS towed by 03 freightliner Columbia HDT 435 hp 60 series Detroit, 10 speed, 3:55 gears with full locker. 260 inch wheel base. I am a Father, Farmer, and A Trucker.
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05-09-2021, 05:36 PM
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#7
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Senior Member
Join Date: Dec 2006
Location: Foxboro Ma.
Posts: 1,080
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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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2015 42' Redwood RL38 Morryde IS , disk brakes, 1920W of solar with Victron everything,5 Battleborn, 2024 GMC DRW 3500HD ,60 gallons of fuel in the bed,Hensley BD5 air ride hitch.
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05-09-2021, 07:18 PM
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#8
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Senior Member
Join Date: Apr 2019
Location: Fort Collins, CO
Posts: 308
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Thanks folks, good advice here
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2021 F350 Lariat SRW Diesel, 2021 Alliance Paradigm 310RL 5th Wheel, Superglide Hitch, 380W Solar, Onan 5500 Propane Genset
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05-09-2021, 07:25 PM
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#9
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Senior Member
Join Date: Oct 2017
Location: Elk Grove CA
Posts: 1,617
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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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BobC
2002 Itasca Suncruiser 35U
Workhorse Chassis
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05-09-2021, 08:40 PM
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#10
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Registered User
Join Date: Aug 2018
Posts: 1,974
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Quote:
Originally Posted by BCam
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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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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05-09-2021, 10:33 PM
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#11
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Senior Member
Join Date: Oct 2017
Location: Elk Grove CA
Posts: 1,617
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Quote:
Originally Posted by Jshopes81
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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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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BobC
2002 Itasca Suncruiser 35U
Workhorse Chassis
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05-10-2021, 07:22 AM
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#12
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Senior Member
Join Date: Aug 2019
Location: Dayton, Ohio
Posts: 354
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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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2006 Keystone Montana 3500RL
2016 Ram 2500 w/Air Bags & Slider Hitch
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05-10-2021, 07:54 AM
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#13
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Senior Member
Join Date: Mar 2019
Posts: 2,951
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Quote:
Originally Posted by PulNSerenity
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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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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2011 GMC Sierra 3500HD gas 6.0 dually
1994 K1500 Suburban shop mule and plow truck
2006 Lakota 29RKT 5th wheel
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05-10-2021, 09:34 AM
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#14
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Senior Member
Join Date: Nov 2018
Location: Beaver Dam, Wisconsin
Posts: 5,038
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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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Paul Bristol
Kodiak Cub 176RD
Nissan Pathfinder 2015
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