[DeTomaso] Powdercoating Campi rims
Jeff Cobb
jeffcobb1 at me.com
Wed Sep 23 22:25:37 EDT 2015
Brian has done a fine job of laying some info down about unqualified fears regarding powder coating magnesium wheels. Not one of us desires to waste time, money and energy so to wind up damaging our wheels or us if we did cause a metallurgical breakdown.
I had 19 pre 71 Maserati, deTomaso and Lamborghini rims stripped, prepped, cleaned and powder coated in 2007. Only one had a problem, I dropped a wrench on an Espada rim while rim was laying on floor. It created a small chip which I filled in with silver color WURTH rim paint and a pinpoint brush. No other issues have shown up. The Bora and Ghibli rims were done normal thickness while the Espada and Mangusta rims were done thin coat, {3 mills ? or so } because it was important that the original rough cast marks and line creases and workers marks still be able to be seen. So the original imperfections are there yet strongly protected with powder coat.
My mechanics and I cleaned all rims with a combination of Aircraft Paint Stripper, scrub brushes, 4,000 psi pressure washer with a rotating 0 deg nozzle, Foamy Gunk and baking soda to neutralize. Sand, walnut shells, glass and soda blasting was NEVER considered as that process will or could, not known to me and not willing to risk, damage and change the grain structure and face pattern of the rims.
We took great care not to damage any of the original Zinc Chromate and if we did then we brush painted more Zinc Chromate over that area.
Then had the powder coat man to heat up the rims and do his job quickly and let the rims cool down overnight in his oven. I believed that heating up quickly which was only getting somewhat hotter, though close to the same heat ramp up time as hard core racing and having the brakes heat the rims.
So I was just using basic liquid cleaners sweat, pressure washer and a hard heat up though slow cool down to cure the paint. They are beautiful and dependable.
Some basic info.
http://www.totalmateria.com/page.aspx?ID=CheckArticle&site=ktn&NM=157
Thanks for the thread,
Jeff Cobb
1316 South Acadian Thruway
Baton Rouge
Louisiana, 70806
On Sep 23, 2015, at 4:18 PM, Brian Dudley <bd8134 at gmail.com> wrote:
> I have had 10 Pantera wheels powder coated and none have failed so far.
> I use nitrogen in my tires and the tire pressure does not vary.
> The finish is more durable than paint, but there is a possibility that
> you can can get out-gassing at any stage and that will cause a bubble.
> The finish is also not dead smooth but a slight orange-peel, you can
> paint over powder coat, it is a great key, if you wish.
> It will help prevent corrosion that mag wheels suffer from especially
> in the hidden areas of the wheel.
> Info..A [1]http://www.panteraplace.com/page41.htm
> "Let me help clear up some misconceptions on powdercoating and
> magnesium.Magnesium has anA [2]ignitionA temp of 1107 and the melting
> point is 2002 degrees F.The temps for powdercoating is 400 for 10-15
> minutes, no where near the critical temps to hurt the magnesium. The
> fires started in machine shops is from fineA [3]metalA shavings and
> dust igniting ,not from a solid mass like a wheel. Powdercoating
> magnesium is NO differant than any other substrate we coat. Bead
> blasting only removes the paint or other coating within a couple of
> thousandths of theA [4]surfaceA and does not effect the integrity of
> the wheel in any manner. The only issue in the past was the amount of
> outgassing magnesium does compared to other CAST metals, but with
> modern outgas forgiving additives forA [5]powder,this is a non issue. I
> have heard the pros and cons of both sides of the coating magnesium
> issue and here is what I have found . There are lots of examples out
> there of people with coated magnesiumA [6]wheelsA that have never had a
> powdercoating related failure and are happy with the better end result
> than you would get with paint. And everyone that says it cannot be done
> cannotA [7]provideA any reasonable data to back up there claim or site
> even one example of there being a recorded failure of a magnesium wheel
> directly related to the powdercoating. But this is just my opinion as a
> professional powdercoater."
> [8]http://www.corvetteforum.com/forums/c5-general/2109442-powdercoating
> -magnesium-rims-2.html
> Posted in 2009 and no one came back to him with a failure.
>
> On Wed, Sep 23, 2015 at 2:48 PM, Michael Shortt
> <[9]michaelsavga at gmail.com> wrote:
>
> A A Rob,
> A A I have heard that real magnesium wheels ( like ours ) do not
> fair well
> A A in a powder coating oven,
> A A something about the heat after all these years making them even
> more
> A A brittle,
> A A I would simply clean them , maybe strip them, spray them with
> Argent
> A A Silver and then a clear coat.
> A A Michael Shortt
> A A On Wed, Sep 23, 2015 at 2:43 PM, Rob Dumoulin
> <[1][10]rob at dumoulins.net>
> A A wrote:
> A A A AA A All this tire information makes me want to dust off my
> original
> A A A rims
> A A A AA A and get some show tires.AAA What is the consensus on
> A A A powdercoating
> A A A AA A original rims?
> A A A AA A Coat just the outer-facing portion?
> A A A AA A Coat both sides?
> A A A AA A Coat the entire rim?
> A A A AA A Rob
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> A A Michael L. Shortt
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> References
>
> 1. http://www.panteraplace.com/page41.htm
> 2. http://www.corvetteforum.com/forums/c5-general/2109442-powdercoating-magnesium-rims-2.html
> 3. http://www.corvetteforum.com/forums/c5-general/2109442-powdercoating-magnesium-rims-2.html
> 4. http://www.corvetteforum.com/forums/c5-general/2109442-powdercoating-magnesium-rims-2.html
> 5. http://www.corvetteforum.com/forums/c5-general/2109442-powdercoating-magnesium-rims-2.html
> 6. http://www.corvetteforum.com/forums/c5-general/2109442-powdercoating-magnesium-rims-2.html
> 7. http://www.corvetteforum.com/forums/c5-general/2109442-powdercoating-magnesium-rims-2.html
> 8. http://www.corvetteforum.com/forums/c5-general/2109442-powdercoating-magnesium-rims-2.html
> 9. mailto:michaelsavga at gmail.com
> 10. mailto:rob at dumoulins.net
> 11. mailto:DeTomaso at poca.com
> 12. http://poca.com/mailman/listinfo/detomaso_poca.com
> 13. http://www.michaelshortt.com/
> 14. mailto:michael at michaelshortt.com
> 15. tel:912-232-9390
> 16. mailto:rob at dumoulins.net
> 17. mailto:DeTomaso at poca.com
> 18. http://poca.com/mailman/listinfo/detomaso_poca.com
> 19. http://www.michaelshortt.com/
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