Archived posting to the Leica Users Group, 2006/01/24

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Subject: [Leica] Painting cameras, the ALPA black crackle finish
From: philippe.orlent at pandora.be (Philippe Orlent)
Date: Tue Jan 24 11:10:26 2006
References: <BAY103-F321A7650DB1B4C1852EFA9C7130@phx.gbl> <003c01c62118$cf1ace50$0202a8c0@jacklcd>

http://www.hammerite.com/uk/products/ 
ps_dtr_metal_paint_colours.html#hammered

is this what you mean?


Op 24-jan-06, om 20:03 heeft Jack C. Herron het volgende geschreven:

> Vick,
>    Wrinkle finishes, as opposed to crackle, which are something  
> different, are created by spraying a special paint, waiting a  
> specified time, say three minutes, then laying down another coat.   
> The wrinkling effect is caused by the solvents in the second coat  
> softening and expanding the partially dried first coat.  This is  
> really just a rigidly controlled example of the failure one  
> experiences when you do not allow adequated drying time between  
> coats of normal paint and get a catastrophic wrinkle.
>    On the plus side, the paint, or I should say, a paint can be  
> obtained in aerosol cans from most full service paint stores or art  
> stores, usually in grey or black.  For the effect the process is  
> reasonably uncritical.  Making a reasonable attempt to follow the  
> manfactorers directions will result in a wrinkle of some sort,  
> acceptable for normal uses, ie, cases on electronic instruments.
>    On the negative side, obtaining a specific pattern of wrinkling  
> is critically dependant on many variables, all of which must be  
> held to close tolerances which are difficult in the home shop.  The  
> effect is dependant, among other things, on the thickness of the  
> first coat, the drying time between coats, the temperature and  
> relative humidity, the thickness of the second coat, the  
> temperature of the final drying (the wrinkling can be hastened by  
> heating in an oven) and the skill with which an absolutely uniform  
> series of coats is applied to a 3 dimensional object.  Also it is  
> likely that the paint that ALPA uses is not the same as that  
> commercially available.
>    I have to admit that I think it unlikely that one would succeed  
> in matching the ALPA coating, but--
>    Having said that, I would, and would encourage you, to go buy a  
> couple of cans, practice with some flat surfaces, cut some wood  
> blocks to approximate camera bodies, practice some more and see  
> what you get.  You might get what you want, in which case, your  
> problem will be to do exactly the same thing again.  You might also  
> find a custom variation which you like better,  your own unique  
> finish.
>    In any event, it is only a couple of bucks and should be a lot  
> of fun.
>
> Keep pressing the paint can button, it'll come unstuck!
>
> Cheers,
> Jack
> Jack C. Herron
> 8118 E. 20th St.
> Tucson, AZ 85710
> 520 885-6933
> ----- Original Message ----- From: "Javier Perez"  
> <summarex@hotmail.com>
> To: <lug@leica-users.org>
> Sent: Tuesday, January 24, 2006 10:52 AM
> Subject: RE: [Leica] Painting cameras, the ALPA black crackle finish
>
>
>> I think it has something to do with painting in a hot surface or  
>> painting over a coat that reacts slightly. Voigtlander is now  
>> doing a crackle finish on the new bessas I think.
>> Javier
>>
>>> From: <vick.ko@sympatico.ca>
>>> Reply-To: Leica Users Group <lug@leica-users.org>
>>> To: <idcc@kjsl.com>, <lug@leica-users.org>
>>> Subject: [Leica] Painting cameras, the ALPA black crackle finish
>>> Date: Tue, 24 Jan 2006 10:33:04 -0500
>>>
>>> To those who paint cameras, does anyone know how to create the  
>>> ALPA black crackle finish?
>>>
>>> I would love to have an M3 with that finish.
>>>
>>> Can this be done "at home"?
>>>
>>> regards
>>> Vick
>>>
>>>
>>> _______________________________________________
>>> Leica Users Group.
>>> See http://leica-users.org/mailman/listinfo/lug for more information
>>
>>
>>
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
>
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>


Replies: Reply from bruce at ralgo.nl (bruce) ([Leica] Painting cameras, the ALPA black crackle finish)
Reply from jackherron at cox.net (Jack C. Herron) ([Leica] Painting cameras, the ALPA black crackle finish)
In reply to: Message from summarex at hotmail.com (Javier Perez) ([Leica] Painting cameras, the ALPA black crackle finish)
Message from jackherron at cox.net (Jack C. Herron) ([Leica] Painting cameras, the ALPA black crackle finish)