Those that coated their undercarriage with POR-15

[thatJeepguy]

POR-15 is good stuff. If you took the time to do the surface prep and applied the POR-15 according to the directions, that stuff will outlast the truck. Probably looks great too.

Source: I did my lifted 2016 Jeep Rubicon's undercarriage with POR-15.

My 2018 JL rubi rusted like a bitch on the welds and frame wayyy too prematurely .

 

[DINOZR]

My 2018 JL rubi rusted like a bitch on the welds and frame wayyy too prematurely .

Jeeps are terrible about developing surface rust if you look at them wrong. I feel like all manufacturers are falling short there these days. Toyotas had a terrible rust problem 10-20 years ago. The rear end of my 2019 had small spots of surface rust when I drove it off the lot with 100 miles. I feel like none of them care about it very much.

 

[thatJeepguy]

Jeeps are terrible about developing surface rust if you look at them wrong. I feel like all manufacturers are falling short there these days. Toyotas had a terrible rust problem 10-20 years ago. The rear end of my 2019 had small spots of surface rust when I drove it off the lot with 100 miles. I feel like none of them care about it very much.

I could tell it had something to do with metal quality. I wanted to keep it forever but traded it for the raptor because I could tell im going to need new suspension components because of all the ****** rust on the welds etc. all the aluminum on the ford is awesome. .

 

[SkyPilot]

In the hangar we use a fogger with a wand that we bought from Lear Chemical that makes ACF-50. However, I talked with their engineers and they said the cheapo foggers at Harbor Freight work fine. The objective is to let it fan out and spread out from a mist. They also sell it in a spray can, but I did a little touch up with it and I agree with the engineers that the spray can is too heavy a spray and difficult to control. A fogger with a wand is definitely the way to go. I did it almost a month ago and been back from Colorado a couple weeks and it seems to have worked awesome. BTW it goes on as a clear film that gets a molecular bond and looks shiny at first but it weathers to not be noticeable.

 

[CobraJay]

What does the wand attachment you use/suggest look like, I have a Lemmer 460HD (wands pictured) and the WW Pro sprayer (360/straight hoses not pictured). I planned on warming up the FF and WW this season to try and get better aerosolization but I dont think it will ever be as good as the ACF-50 since its much more liquid.

 

[Badgertits]

You either want this:https://www.daubertchemical.com/store/product-list/corrosion-prevention/nox-rust-x-121b

Or Amsoil HDMP…I’m always a proponent of Yamashield Protectant spray too however it is not as strong/permanent as the other 2 (unless applied directly to bare aluminum) however it’s less aggressive & can be reapplied over any substance including on top of an existing undercoat product, and it leaves no color & smells good.

Wool wax & fluid film seem to attract too much dirt & come off much easier (fluidfilm esp) that por15 product is not a bad choice although I always considered that more a pre-treatment to either an already rusted piece of metal or a pre-treatment prior to doing a coat of paint. It’s literally a “rust converter” more than it is a rust inhibitor

 

[Badgertits]

Amsoil HDMP is what I use as well, someone did a pretty extensive comparison on here at some point for corrosion in FL weather and, “it won” it refuses to be washed off, I used pressure washer and scrubbed for a number of hours prior to reapplication and I don’t think I got much off. I was just trying to get the dirt mostly off before reapplication this fall. Either way I sprayed it again. It works well for sure.

When I was rebuilding shocks on my snowmobile I did find that carb cleaner does take it off easily. Aside from that it doesn’t come off, which is exactly what I wanted. Does have a bit of a yellow color, which is better than rust.

I don’t plan on selling, ever.

This is why I love it too- if you go w/ 2+ even coats it literally turns to a beeswax consistency that’s essentially permanent or at least semi-permanent. You’d need a boat load of degreaser & a steam pressure wash to even hope to remove the coating on my truck. Give yourself a couple days too lol

And that “beeswax” term is key- that’s literally what it looks/feels like, slightly tacky but super hydrophobic, I’ve had it LOOK like a ton of dry dirt road dust coated the entire undercarriage Stuck to everything (like exactly what would happen to a truck treated w/ fluid film or wool wax) only to be able to have all of it wash right off w/ a no pressure garden hose. The slightly tacky shell lets the dust adhere slightly but immediately washes off w/ water & beads up. Can’t say enough good things about it & my truck is on its 2nd winter w/ 22k miles (bought in Nov of 2021) and my previous 2018 Raptor looked pristine w/ 42k miles on it & 2.5 winters till it got totaled lol

 

[Mister Pinky]

We use ACF-50 (Anti Corrosion Formula-50) exclusively on our airplanes. We fog inside the wings and fuselage structure at every annual inspection. It is totally FAA approved since we operate to commercial standards. Application goes over the wiring and everything. Some of the planes are 40 years old and are based on the west coast getting constant ocean air. Inside the wings etc the aluminum and steel fittings look new. Our chief of maintenance with 20 years experience will use nothing else. The Porsche, Ferrari and motorcycle guys are raving about the stuff on their forums. But, I've never seen anything on this forum. We have flogged some trucks under the hood and whole chassis with great short term success. But, no long term truck results. Anybody else tried it?

I haven’t heard of it much less tried it, but if you have a link to the product I’d love to see it.

 

[LADRECH]

We use ACF-50 (Anti Corrosion Formula-50) exclusively on our airplanes. We fog inside the wings and fuselage structure at every annual inspection. It is totally FAA approved since we operate to commercial standards. Application goes over the wiring and everything. Some of the planes are 40 years old and are based on the west coast getting constant ocean air. Inside the wings etc the aluminum and steel fittings look new. Our chief of maintenance with 20 years experience will use nothing else. The Porsche, Ferrari and motorcycle guys are raving about the stuff on their forums. But, I've never seen anything on this forum. We have flogged some trucks under the hood and whole chassis with great short term success. But, no long term truck results. Anybody else tried it?

Is this true? I’m looking for the best undercarriage spray over rust available.

 

[SkyPilot]

Longer term update:
My 2020 Scab is almost 3 years old now and I was crawling around under there recently and my answer is YES it’s true!!! I do the treatment once a year and it still looks new. What I said about the fogger is really true too. I used the spray can version once and it comes out like a squirt gun and IMO was way too thick and messy. The ACF-50 customer service people told me to buy the cheapie Harbor Freight fogger. I am blessed enough to use the proprietary fogger at the hangar so I don’t know about which fogger works best, I just know I’d use one. I know too that it does seem to hold dirt a bit more than nothing. This is especially true if you put it on too thick-ie spray can. But, to me given a choice between a thin dirt film and corrosion there is no contest.