2019 Mustang GT Paint Issue (Hood)

[Gregs24]

First we sand down the metal to get it as clean as possible. Then we apply Oxyphos to the metal for a few minutes, and rinse. We do that at least 2 or 3 times making sure the phosphoric acid gets everywhere. We then sand one last time, wipe with alcohol, and immediately spray 2 coats of etch primer. Then we start the painting process.
Using this method we find corroded aluminium lasts about 4 to 5 years before it starts showing up again. Remember this is on a boat in a harsh marine environment. On a car, i would expect it to last a few years longer before seeing it come through again.
There is another product from Vanchem called Fostex JMF that looks very promising, but i have yet to find a distributor in the EU for it.

It is worth mentioning aluminium oxide forms on the surface VERY quickly (seconds) so the gap between prep and primer needs to be as fast as possible. It is also worth mentioning the effects will rarely become structural as with steel, but just a mess cosmetically.

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[DB83]

It is worth mentioning aluminium oxide forms on the surface VERY quickly (seconds) so the gap between prep and primer needs to be as fast as possible. It is also worth mentioning the effects will rarely become structural as with steel, but just a mess cosmetically.

That's right. Hence the importance of getting the etch primer on as quickly as possible

 

[tw557]

That's right. Hence the importance of getting the etch primer on as quickly as possible

Do you have an etch primer brand recommendation? I assume it will be just a single stage? I bought the 2 stage epoxy primer thinking that was going to be tougher. I'll look for some of the etching chemicals you mentioned too.

 

[DB83]

Do you have an etch primer brand recommendation? I assume it will be just a single stage? I bought the 2 stage epoxy primer thinking that was going to be tougher. I'll look for some of the etching chemicals you mentioned too.

Not really, whatever is available locally at the time. Mostly AwlGrip or AlexSeal

 

[HoosierDaddy]

I'm glad they're giving you a new hood because even if sanded and repainted, that area will always corrode. No way to repair this issue. You can only replace and hope for the best.

That's my understanding but not sure why that's the case. Why can't the contamination be removed unless the aluminum was contaminated through and through from the mill?

 

[HoosierDaddy]

Two things I’m wondering about now. She told me Ford will send them a bare hood, they paint it (dealership’s body shop) and then call me to swap the hoods out.

1. I should have a new 3yr warranty on new hood for future paint defects?

I doubt that will happen. Its pretty standard for the warranty on replaced/repaired parts on most products to be either a set amount of time (eg. 1 year) or the original warranty expiration, whichever comes last. One reason for that is to discourage customers sabotaging things and the other obvious one is the original warranty period is all you were promised. Sad facts of life.

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