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CMC ZINC ROT!


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#26 OFFLINE   JimboCARS

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Posted 18 September 2018 - 12:02 AM

Ah, thank you for this information.  That's great to know!
Which other models are also ones to avoid?  I've heard that the W125 can suffer, and also the 300SL Panamerica - is this true?
Best wishes,
Jamie

Edited by JimboCARS, 18 September 2018 - 12:18 AM.

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#27 OFFLINE   Stirling_Moss

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Posted 18 September 2018 - 12:35 AM

No W125
early Panamericana #4 ( M-023 first edition in blue box ) is to be avoided , second run of the M-023 ( unlimited edition ) which was made together with the limited #3 (M-058 ) is fine
M-058 #3 is OK too.
The famous 300 SL "Le Mans" #21 ( M-029 ) has 2 versions !!!
The exhaust is different in both versions and to avoid are those with the exhaust that goes thru the bodywork, Those with their exhaust underneath the model are in better shape ( read lesser risk )

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#28 OFFLINE   JimboCARS

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Posted 18 September 2018 - 01:35 AM

Ok, thanks.  More priceless info!

I did however see a photo on Facebook recently, of a W125 with zinc rot.  I can't find it now, but will keep searching

Edited by JimboCARS, 18 September 2018 - 01:55 AM.

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#29 OFFLINE   X-Filer

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Posted 18 September 2018 - 04:41 PM

View PostJimboCARS, on 17 September 2018 - 02:03 PM, said:

You're talking paint rash which is a completely different kettle of fish.  Zinc rot is poor quality raw material that degrades over time - I wouldn't think humidity has anything to do with it (but I might be wrong).

I'm not so sure they're all that different things. All the "paint rash" I've seen so far seems to come from underneath the paint and not the paint itself but at this point I'm the one who might be wrong. Regarding the "zinc pest" or "zinc rot", I've found several sources mentioning the influence of moisture:

https://en.m.wikiped.../wiki/Zinc_pest

https://www.tapatalk...one-t70956.html

The Wikipedia article actually cites the National Aerospace Laboratory in this matter. The second link is quite clear about the relation between moisture and zinc pest:

"From what I can gather, when Mazac is produced, its crystalline structure contains boundaries between the harder zinc crystals and those crystals formed by the melting and fusion of zinc and aluminium. Impurities such as cadmium, tin and lead, are activated by moisture, which starts an electrochemical process, by which lead (insoluble in Zinc) is drawn out from between the alloy crystals and cadmium is leached from the actual crystals themselves. The impurities are then deposited at the boundaries between the two types of crystal.
The greater the moisture and the finer the crystals, the faster the corrosion."

Hope it helps!
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#30 OFFLINE   JimboCARS

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Posted 19 September 2018 - 12:01 AM

Thanks X-filer.
Stirling Moss, here is another W196 but with the black seat - definite zinc rot on the nose.  https://www.ebay.co.uk/itm/Cmc-Mercedes-Benz-W196-1-18/183433750256?hash=item2ab580e6f0:g:EooAAOSw9yJbm9Hx

I have the black seat basic version, and my nose looks to be affected too, albeit at an earlier stage of degradation.
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#31 OFFLINE   JimboCARS

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Posted 19 September 2018 - 02:10 PM

Well, this one went for £205 plus postage.  It's cracking and crumbling to pieces!!!
Can anyone explain this price to me please?

https://www.ebay.co....5.m43663.l10137

Unbelieveable!!
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#32 OFFLINE   JimboCARS

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Posted 30 April 2019 - 10:25 AM

Another CMC with zinc rot, this time the Renntransporter 1954 Merc.  Arghhhhhh!!!!!!!!!!!!!!!!

https://www.ebay.co....353.m1438.l2649

This is very worrying.  Shame on you CMC for such poor control over production.
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#33 OFFLINE   Craig

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Posted 30 April 2019 - 10:46 AM

I did audirs6 off here a favour and had an AUTOart Goldeneye DB5 sent to me to send on to him. It was still with the door securing transport strips on etc, but the doors had broken in half en route it was so rotten!

F**k you Photobucket.



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#34 OFFLINE   MerkurKing16

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Posted 30 April 2019 - 05:44 PM

Damn, that Renntransporter went for a good bit of money too.

I acquired some early CMCs years ago including that one. Luckily they were in great shape when I sold them all. Except a W196 which was crumbling apart so I sold it for “parts”.

#35 OFFLINE   Guiddy

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Posted 01 May 2019 - 03:35 AM

I constantly keep an eye on my Bartoletti! Could you imagine if that starts turning! :gaah:




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