LAC: Red paint prone to oxidation?

[LL - NY]

A former collegue, whom was an engineer at PPG said that the pigments
in red paint (FeOs) are prone to oxidation, and added that red is the color
most
likely to fade in panels (i.e. the door will fade to a different shade than
the fenders, and even within one panel, it'll fade in panels, for example
above a moulding line could fade to a different shade than below). So as
an across the board statement, I think it's safe to assume reds are the
worst. He also noted that whites tend to be the thinnest paints due to
the type of pigments (TiOx's). Never did garner any greater details from
him because it was a conversation in passing. I did note that he tended
to purchase lighter blue colored vehicles consistently, and since he wasn't
the type to give a fig about cosmetics (the quintesential engineer) there
may
have been a practical reason behind this.

Oh, BTW, the Ford class action suit was in regards to paint adhesion on
their
galvanized pick-up trucks and other light trucks, it had nothing to do with
fading.
One of my SCCA friends was the recipient of 2 free (very well done, I might
add,
and the 2nd one took well) COMPLETE paint jobs courtesy of FoMoCo on his
tow vehicle. I don't know what GM's class action suit was about.

LL - NY

On 2/23/06, Brett Dikeman <quattro at frank.mercea.net> wrote:
>
>
> On Feb 23, 2006, at 6:51 AM, Eric Sanborn wrote:
>
> > I think it is more tied to the type of paint.  Sadly my charcoal
> > colored 4ktq is having some serious oxidation problems on roof and
> > deck lid.  My unscientific observation is that certain automakers had
> > problems with paints through the certain periods. i.e Fords from mid
> > 80s to early 90s.
>
> Ford and GM both had massive problems with paint back in the 80's/
> 90's, and there were class action lawsuits against both, I believe.
> At least one was successful.
>
> > But maybe it is color dependant.  It would seem
> > that darker colors would be worse since they absorb more of the
> > spectrum of sunlight.
>
> If that's the case, why hasn't my black 200q20v oxidized in the
> slightest...
>
> A google search turned up a Meguire's article saying that non-
> clearcoated cars will oxidize in the color layer.  Clearcoated cars
> will oxidized in the color layer very slightly, but the clearcoat is
> specifically formulated to absorb+resist UV.
>
> Then again, it also goes into that fairly-land BS about "replenishing
> the natural oils in your paint"...
>
> Brett
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