2021 Tahoe rust protection/undercoating

[21TAHOEMN]

Had the vehicle rust projected and they said they don’t spray the frame do to a wax like coating. Anyone know about this? Was charged full price for half the work!

 

[Rdr854]

My understanding is that aftermarket rust proofing will void the OEM rust perforation and corrosion warranty. The wax like coating on the frame is part of the rust proofing and anti-corrosion countermeasure from GM.

 

[21TAHOEMN]

My understanding is that aftermarket rust proofing will void the OEM rust perforation and corrosion warranty. The wax like coating on the frame is part of the rust proofing and anti-corrosion countermeasure from GM.

Would you leave it or coat over it any ways?

 

[cardude2000]

Serious question as I never own a vehicle with more than 70k miles on it...is rusting through frames really still a thing?


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[ivin74]

Get your money back, you will probably sell the rig before you see rust on those new tahoes, most of the panels are made out of aluminum.

 

[Rdr854]

Would you leave it or coat over it any ways?

I would not use any aftermarket rust proofing. I would rely on the rust proofing and anti corrosion steps taken by the manufacturer.

 

[Rdr854]

Serious question as I never own a vehicle with more than 70k miles on it...is rusting through frames really still a thing?


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It has been a problem with some vehicles, where manufacturers have been required to replace the frames under a recall and class action suit settlement. This was a big issue for Toyota trucks.

 

[kiwi]

Not sure about your weather and dirt/salt/road chemicals conditions in US/CA, but here in Russia we usually consider manufacturer "coating" as a transporting grease only.

So Krown, RustStop, Dinitrol and so on is almost a must.

 

[ytechie]

I'll probably spray mine with Fluid Film. I use that stuff on the bottom of my RV, snowblower, etc. Lots of videos on YouTube showing it being used.

 

[21TAHOEMN]

Serious question as I never own a vehicle with more than 70k miles on it...is rusting through frames really still a thing?


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there are other benefits to the under coating. Sound deadening and a warranty depending on the installer

 

[PG01]

https://nhoilundercoating.com/

 

[Rdr854]

there are other benefits to the under coating. Sound deadening and a warranty depending on the installer

But the crucial question is whether or not the application of undercoating will void the OEM rust/corrosion warranty.

 

[wjburken]

Serious question as I never own a vehicle with more than 70k miles on it...is rusting through frames really still a thing?


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In the areas that put a lot of salt on the roads during the winter, rust shows up in lots of different ways. That being said, I have a 1997 K1500 with 170K miles on it with serious fender and rocker panel rust, but the frame is still solid, albeit rusty.

I had a 2007 Yukon Denali with 300K of Iowa/Midwest miles on it and rust on the frame was not an issue.

 

[sd172]

I got mine undercoated with WoolWax last fall, and going for a second treatment this Friday. It doesn’t cause the factory frame coating to bubble up like the Fluid Film does (seems to be an issue only with GM trucks).
The factory undercoating is garbage at best. It personally bothers me to see the underbody rust on a 1-2 years old $50k plus SUV.

 

[Avalanchediver]

I spray motor oil on my underside here in Michigan every winter. Seems to work great...
Downside is doing it every year.

 

[GTNator]

I spray motor oil on my underside here in Michigan every winter. Seems to work great...
Downside is doing it every year.

Isn’t that flammable? Hot exhaust, etc.


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[Avalanchediver]

Have never had a problem. Of course the truck is not running while I spray it either.

 

[ytechie]

I got mine undercoated with WoolWax last fall, and going for a second treatment this Friday. It doesn’t cause the factory frame coating to bubble up like the Fluid Film does (seems to be an issue only with GM trucks).
The factory undercoating is garbage at best. It personally bothers me to see the underbody rust on a 1-2 years old $50k plus SUV.

I have a ton of FluidFilm - are you recommend I avoid using it on the Yukon?

 

[olyelr]

The factory installed treatment on these gm frames is a complete joke in my opinion. Complete garbage. Yea the frame might not rust through for a long time, but it sure looks like shit in no time. My wifes 2 year old denali frame looked waaaaay worse than the frame on my 2000 dodge ram after 11 years of michigan winters.

 

[olyelr]

I have a ton of FluidFilm - are you recommend I avoid using it on the Yukon?

I would steer clear of the frame for sure. But saturate the living hell out of the inner fenders and rockers/cab corners etc. Ooooooooo that smell, gotttaaaa love that smeeeellllllllll! Lol