Best Undercoating?

[sdeeter19555]

Yeah I haven't sprayed it over undercoating or anything - then again maybe I have - I just have used it on the pinch welds on my car right before winter starts. Seems to do ok, nothing special. I kind of look at it as a temporary solution that needs to be reapplied. I think most stuff will work temporarily...oil, penetration oil, rtv, grease, paint...but none of those is a long term set it and forget, fix.
 
I had a leaking oil pan on an Accord I used to own, that oil pan was probably the only thing that wasn't rusted on that car. 
 
There's always POR 15. But get any of that on you and it's never coming off, lol.

POR15 isn't permanent either...it will eventually get compromised, rust, and then you really have a mess to deal with...

2012 2500hd 6.0l CCSB 4wd

[sdeeter19555]

My '15 does not appear to have any type of coating that could peel off and no signs of unusual amounts of rust.  Other than the obvious appearance issues,  has anyone experienced any functional issues related to rust on a newer vehicle?  Many years ago I had a '76 GMC 3/4 ton and my mechanic once showed me my floor mats from underneath the truck while up on a hoist.  I put a few pieces of plywood under the mats and kept on trucking!

 

I've seen some rejected by state inspection for too much rust through...but they were still driveable.

 

Ohio was the worst for rust, they are in the rust belt and they had no real inspection. I watched a guy driving a 80s Ramcharger pull into a rest area along I80 back in the 90s. He stood up inside the truck, feet in the ground, opened the door, and stepped over what remained of the door sill/rocker panel...it had no floors!

 

2012 2500hd 6.0l CCSB 4wd

 

[pickmeup]

Here in Maine quite common to see trucks untreated needing rocker panels and rear cab mount work. Brake lines and fuel lines rotted along with gas tank straps. Rear spring shackles and usually rear crossmember up underneath spare is rotted.Fender wheel wells especially rear are vulnerable and many have perforation and rear bumper skin usually is rusting pretty hard. Time frame is mostly 8-10 years. Those that Krown or fluid film etc there trucks fair much better. 

[OldBlue61]

23 hours ago, sdeeter19555 said:

 

Ohio was the worst for rust, they are in the rust belt and they had no real inspection. I watched a guy driving a 80s Ramcharger pull into a rest area along I80 back in the 90s. He stood up inside the truck, feet in the ground, opened the door, and stepped over what remained of the door sill/rocker panel...it had no floors!

 

2012 2500hd 6.0l CCSB 4wd

 

 

I can vouch for that!  We go through so much salt in this state that it's about to be made the official state symbol, next to the orange barrel!

[NWI Denali]

On 4/20/2018 at 5:18 PM, Doublebase said:

I don't know what's on the 2019's but the sales guy that sold me my 2018 last weekend said that the frames have a new undercoating on them for 2018. Don't know if that's true, doubt it seeing as how the guy didn't know what direct injection was or that the truck had electric steering. Pointed that out to him and he said no, it's got regular sterring. Asked him to point to the power steering pump and he pointed to the water pump.

 

But the frame does have a very tacky black coating on it...doesn't seem to be working as there already is rust in spots were the coating has rubbed off.

Rule #1 about dealerships... do not believe anything a salesman says. They are beyons clueless about their own product they sell.

[Ravenkeeper]

Had a friend tell me to use Rhino-liner.  Not to sure if I would go that route.

[adamj2121]

On 5/2/2018 at 7:53 PM, Ravenkeeper said:

Had a friend tell me to use Rhino-liner.  Not to sure if I would go that route.

I definitely wouldn't do rhino-liner for the undercoating. Line-x has a specially formulated undercoating spray they use, it isn't the same material as the bed liner. Rhino Lining would look good and work well on the inner fender areas below the bed. There are too many areas underneath the truck though where I don't believe the liner  would hold up. Plus you would need to mask basically every rotating part and be very cautious, compared to a normal undercoating. 

[Shortyjpl]

Just had my 18 CCSB undercoated with Line-X. Looks great as far as application and protection. I’ll have to take pics when it stops raining!

[Daly]

I do Krown on all my vehicles. I have it touched up every year and it worked great. But honestly what ever you go with, as long as it seeps and doesn't dry up, it'll work. And have it touched up every year. My 1991 C2500 has been undercoated ever year since day one and there isn't a spot of rust, now I just wish the previous owner took the time to take care of the paint. 

[Grumpy Bear]

http://www.cosmolinedirect.com/cosmoline-black-rust-veto-344/

 

This is my go to. 

[R_cicero]

So is a Ziebart undercoat or any coating good for my truck? I’m in buffalo ny. 2020 Chevy 2500

[zibzer]

On 4/18/2018 at 3:09 PM, frenchsquared said:

GM says that our trucks don't need any type of under coating. They are likely correct for the 3 yr warranty period. Some people like me want to keep there new truck for many years. So what does everyone feel is the current best rust protection? I have been thinking about spraying the underside of the truck with oil ever few years. I thought it was a crazy idea but I have seen talk of this in other threads. Personal experience has shown me that old trucks the leak a lot of oil tend to have solid floor bards. The steady oil leak stops them from rusting. 

 

Im not sure if a spray on bed line will stick on top of the coating the factory added. 

 

Whats is everyones thoughts? 

The Canadian Military did a test a while back and found a product called “corrosion free formula 3000” was the best at limiting rust on vehicles.
Krowns product is good though did not come up first in the militaries study.
However, application centers for “corrosion 3000” are limited and the places that do use their product dont always apply it thoroughly. The people at Krown application centers do a very thorough job in my experience and this is why I would suggest Krown. 

[Black02Silverado]

AMSOIL's Heavy-Duty Metal Protector is a good choice for keeping the rust away.  It is easy to spray on and get into tight spots.  The only bad thing is it isn't available in Canada.

 

Taken from AMSOIL's web page.

 

Heavy-Duty Metal Protector

Product code : AMHSC-EA

Corrosion Inhibitor

Made with special rust and corrosion inhibitors. Excellent on metal surfaces, leaves a long-lasting protective coating. Protects against the effects of salt, moisture & chemical corrosion. Works as an undercoat, leaving a wax-like amber film. **NOT AVAILABLE IN CANADA

[truckguy82]

I believe project farm did a test on anti rust coatings, possibly specifically for frames

 

if you don’t know project farm youtube channel, you should

 

he’s like consumer reports, only better, for tools and diy products. He tests tools and chemicals.

[truckguy82]

2 hours ago, zibzer said:

The Canadian Military did a test a while back and found a product called “corrosion free formula 3000” was the best at limiting rust on vehicles.
Krowns product is good though did not come up first in the militaries study.
However, application centers for “corrosion 3000” are limited and the places that do use their product dont always apply it thoroughly. The people at Krown application centers do a very thorough job in my experience and this is why I would suggest Krown. 

Do they even salt the roads in canada? When I was stationed in north dakota, they never salted the roads because it was too cold for salt to melt the snow. They just used dirt.

Edited November 7, 2020 by truckguy82