1992 Paint Discoloration Under Hood

[Chrispy62]

My 1992 5.0 LX is pristine with 62k miles, always garaged a true survivor 100% original Titanium Frost factory paint.
The only issue I have is discoloration under the hood on the radiator support and around both sides under the fender mounting bolts
I was told that this occurs over time due to a rust inhibitor that was sprayed at the factory.
Can anyone confirm this and possibly recommend something to clean it off without harming the paint?
Thanks!
Chris

 

[Mstng93SSP]

Can you post pictures? Are you talking about rustproofing spray or just faded paint? If it is undercoating/rustproofing there are companies that use dry ice to remove it.

 

[Chrispy62]

It's definitely not the paint fading.
I'm out of town until 12/26, I'll post a picture then.
Any more info on how dry ice is used?
Thanks!

 

[Chrispy62]

 

[Chrispy62]

Here's a picture

 

[Chrispy62]

Can anyone recommend a mild chemical that could remove this discolored factory rust inhibitor?
It's really yellowed over the years ( see above picture) and as the rest of the car is perfect, really needs to be taken care of!
Thanks!

 

[85GTStangGuy]

I'd try wax & grease remover first... though I really don't think it's gonna work.... it's just where I'd start. If that doesn't cut it, I'd try mineral spirits next.

 

[Chrispy62]

Thanks!

 

[General karthief]

Removing/treating the discoloration depends on what it is, wax and grease remover is a good place to start, likely not to harm the paint, though it will remove the factory markings most times.
I've not heard anything about a factory/dealer treatment applied on top of paint but I'm just just a back yard hack.

 

[Chrispy62]

Thanks