Rust on factory GMC bed liner

[Alabama]

I have a 2021 gmc 1500 that came from the factory with a spray in bed liner. A ring of rust has developed around the edge of the bed with the exception of the tailgate. Has anybody ever seen this before? I live in birmingham, Al so salt air and salt on the roads is not an issue.

 

the only fix I know is to redo the liner.

 

I never had this issue with a line x

[newdude]

36 minutes ago, Alabama said:

I have a 2021 gmc 1500 that came from the factory with a spray in bed liner. A ring of rust has developed around the edge of the bed with the exception of the tailgate. Has anybody ever seen this before? I live in birmingham, Al so salt air and salt on the roads is not an issue.

 

the only fix I know is to redo the liner.

 

I never had this issue with a line x

 

 

Get some of this - Adam's Iron Remover | Paint Decontamination For Industrial Fallout - Adam's Polishes (adamspolishes.com)

 

And spray the area in the bed that has that.  See if it will remove it.  

[Bikerjon]

I have seen Line X liners rust but this was on heavy use fleet vehicles.

[Alabama]

I am going to let GMC fix this. Never seen a bed liner rust.

[redwngr]

Is rusty water dripping onto the liner from somewhere above? 

Something rusty sitting in bed and got water running over it?

 

(from truck or accessory or something it carried or something it was parked under)

[CamGTP]

Pretty likely that the liner isn't rusting, it's not metal. It's more likely that stuff that surface can rust. Like steel/iron particles that react with water.

[Alabama]

I don’t know where the metal would have come from. Sits outside all the time.

[newdude]

2 hours ago, Alabama said:

I am going to let GMC fix this. Never seen a bed liner rust.

 

 

Try the iron remover first.  Dealer/GM won't do anything other than try and clean it with something anyway so don't waste your time going there just yet.

 

Looking again at that picture you posted, to me it doesn't appear to be coming from behind the liner.  Its from something sitting in the bed.  Chemicals, rusty water, etc.  

[Enough]

Do you have a lawn sprinkler system at home or at work that "irrigates" your truck too ?

 

I have a friend in Florida that had something similar happen the the whole front clip of the 2017 Silverado. Turned out the water in his neighborhood had a high iron content and his sprinklers doused his truck every time they turned on. The water dried quickly when it hit the hot sheet metal and left traces of iron behind. He ended up putting a filtration system in his water line. The truck was professionally cleaned with oxalic acid then buffed. Look good as new. I know this solution will not work with bedliner but your tap water may be the cause.

[MrMagloo]

I think you need to differentiate whether the rust is sitting on top of the liner material, or is the rust coming from beneath.  It appears to me as well that there is some kind of a contamination sitting on top of the surface of the liner material that is rusting or simply leaving a rust ring, and not the liner itself. Could be from remaining particles from something you've hauled, could be from iron rich water pooling or acid rain drying, could be any number of reasons that is not a defect of the liner.  It's simply looks like a stain sitting on top of the liner material.

 

I'd also suggest you get some iron remover and give it a scrub.

[Alabama]

I bought some iron remover and will try this evening. Thanks for the ideas.

[eppieguy]

Looks to me like rusty water stain, not rust, I'd clean it like others suggested and keep an eye on it. Can you go under the truck and see if you can see any rust under that area?

 

[BigMick2023]

Well water?

A lot of iron in most well water.....would be my guess. 

 

Rust can't form on the Bedliner material, it's not metallic. 

 

[Alabama]

Birmingham Al city water. All pipes are copper or pvc.

[Enough]

There's your problem, the Vulcan peed in your bed !