[DeTomaso] Powdercoating Campi rims
Michael Shortt
michaelsavga at gmail.com
Wed Sep 23 15:31:08 EDT 2015
Thanks for clearing that up,
Michael
On Wed, Sep 23, 2015 at 3:28 PM, <MikeLDrew at aol.com> wrote:
>
> In a message dated 9/23/15 11 49 14, michaelsavga at gmail.com writes:
>
>
> I have heard that real magnesium wheels ( like ours ) do not fair well in a
> powder coating oven,
> something about the heat after all these years making them even more
> brittle,
>
> >>>You're confusing several conflicting ideas.
>
> Our wheels often don't do well in powdercoating because they have tiny
> cavities filled with gas, and when the wheel is first painted and then
> heated, the gas expands and creates bubbles in the paint.
>
> Some people claim that magnesium wheels become brittle with age (although
> I have never, EVER heard of a Pantera wheel failing due to that, so I chalk
> it up to urban legend). However, years ago Jack and I wrote an article
> about the care and feeding of such things, and Jack asserted that they can
> be returned to like-new condition by annealing them. This involves heating
> them up in an oven (like a powdercoating oven) and then allowing them to
> cool slowly.
>
> So if you want to powdercoat wheels, first you strip them, then put them
> in a powdercoating oven at the end of the day; this heats them up to full
> temp and then they cool down overnight. Then they can be powderpainted in
> the morning, and put back in the oven in the normal fashion to bond the
> powderpaint to the wheel.
>
> Garth Rodericks has done a magnificent job of powdercoating his own wheels
> using a kit (from Eastwood I think?) and an old kitchen oven.
>
>
> >I would simply clean them , maybe strip them, spray them with Argent
> Silver
> and then a clear coat.
>
> >>>That's generally what I advocate too, except you can't just strip them
> and paint them silver. The unique characteristics of magnesium require
> much additional care.
>
> Ford issued a bulletin to the dealers advising them that the standard Ford
> Argent Silver was a suitable color, but I don't really believe that's
> true--I think the Ford color is too bright.
>
> The code is PPG3822C, which corresponds to Ditzler DX8555.
>
> Campagnolo made the OEM wheels for all the Italian marques (Ferrari,
> Lamborghini, Abarth, Maserati etc.) and I think they only had a handful of
> stock colors (silver, gold mostly).
>
> The original magnesium wheels were first painted with a zinc chromate
> green primer/sealer, then painted silver atop that. If they strip the
> wheels to metal and just paint them without the zinc primer, corrosion
> could well set in and the paint might fail.
>
> If you really wanted to go crazy, after the wheels were stripped to metal,
> you would need to ship them off to have them Dow 17 anodized (Google it),
> then painted with zinc chromate primer, then silver.
>
> You can spend days reading about this stuff on Ferrari forums. Those guys
> go crazy trying to replicate the original paint hue and finish, and often
> fail and have to do them again and again to get it right.
>
> The stock primer is pretty tough stuff. If you are going to have them
> strip the paint off, perhaps they can do so in a manner that leaves the
> green coating underneath? But failing that, I would definitely urge that
> you seal the wheels properly with zinc chromate (again, this is based on
> both the factory's original technique, and what I've read on these various
> Ferrari forums, learning from the mistakes of others....)
>
> Mike
>
>
>
--
Michael L. Shortt
Savannah, Georgia
www.michaelshortt.com
michael at michaelshortt.com
912-232-9390
This email is protected by the Electronic Communications Privacy
Act, 18 U.S.C. Sec. 2510-2521, is confidential and may be legally
privileged. If you are not the intended recipient, you are hereby notified
that any retention, dissemination, distribution or copying of this
communication is strictly prohibited. Please reply to the sender that you
have received this message in error, then delete it. Thank you
-------------- next part --------------
Thanks for clearing that up,
Michael
On Wed, Sep 23, 2015 at 3:28 PM, <[1]MikeLDrew at aol.com> wrote:
In a message dated 9/23/15 11 49 14, [2]michaelsavga at gmail.com
writes:
I have heard that real magnesium wheels ( like ours ) do not fair
well in a
powder coating oven,
something about the heat after all these years making them even more
brittle,
>>>You're confusing several conflicting ideas.
Our wheels often don't do well in powdercoating because they have
tiny cavities filled with gas, and when the wheel is first painted
and then heated, the gas expands and creates bubbles in the paint.
Some people claim that magnesium wheels become brittle with age
(although I have never, EVER heard of a Pantera wheel failing due to
that, so I chalk it up to urban legend).A However, years ago Jack
and I wrote an article about the care and feeding of such things,
and Jack asserted that they can be returned to like-new condition by
annealing them.A This involves heating them up in an oven (like a
powdercoating oven) and then allowing them to cool slowly.
So if you want to powdercoat wheels, first you strip them, then put
them in a powdercoating oven at the end of the day; this heats them
up to full temp and then they cool down overnight.A Then they can
be powderpainted in the morning, and put back in the oven in the
normal fashion to bond the powderpaint to the wheel.
Garth Rodericks has done a magnificent job of powdercoating his own
wheels using a kit (from Eastwood I think?) and an old kitchen oven.
>I would simply clean them , maybe strip them, spray them with
Argent Silver
and then a clear coat.
>>>That's generally what I advocate too, except you can't just strip
them and paint them silver.A The unique characteristics of
magnesium require much additional care.
Ford issued a bulletin to the dealers advising them that the
standard Ford Argent Silver was a suitable color, but I don't really
believe that's true--I think the Ford color is too bright.A
The code is PPG3822C, which corresponds to Ditzler DX8555.
Campagnolo made the OEM wheels for all the Italian marques (Ferrari,
Lamborghini, Abarth, Maserati etc.) and I think they only had a
handful of stock colors (silver, gold mostly).A
The original magnesium wheels were first painted with a zinc
chromate green primer/sealer, then painted silver atop that.A If
they strip the wheels to metal and just paint them without the zinc
primer, corrosion could well set in and the paint might fail.A
If you really wanted to go crazy, after the wheels were stripped to
metal, you would need to ship them off to have them Dow 17 anodized
(Google it), then painted with zinc chromate primer, then silver.
You can spend days reading about this stuff on Ferrari forums.A
Those guys go crazy trying to replicate the original paint hue and
finish, and often fail and have to do them again and again to get it
right.
The stock primer is pretty tough stuff.A If you are going to have
them strip the paint off, perhaps they can do so in a manner that
leaves the green coating underneath?A But failing that, I would
definitely urge that you seal the wheels properly with zinc chromate
(again, this is based on both the factory's original technique, and
what I've read on these various Ferrari forums, learning from the
mistakes of others....)
Mike
--
Michael L. Shortt
Savannah, Georgia
[3]www.michaelshortt.com
[4]michael at michaelshortt.com
912-232-9390
A
This email is protected by the Electronic Communications Privacy
Act, 18 U.S.C. Sec. 2510-2521, is confidential and may be legally
privileged.A If you are not the intended recipient, you are hereby
notified
that any retention, dissemination, distribution or copying of this
communication is strictly prohibited.A Please reply to the sender that
you
have received this message in error, then delete it.A Thank you
References
1. mailto:MikeLDrew at aol.com
2. mailto:michaelsavga at gmail.com
3. http://www.michaelshortt.com/
4. mailto:michael at michaelshortt.com
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