[Milsurplus] Painting Aluminum - BC-348 in particular

[gl4d21a at juno.com]

Hutch:

There are several problems with crackle paint on aluminum.  One is making it stick, and that is where zinc chromate primer came in.  Not sure it is still legal to sell, but it used to be available in spray cans, and normal can quantities.  The second problem is yours, incompatibility between primer and paint. 

The first problem is overcome with surface preparation, some sort of chemical bath which I have forgotten the details of.  Strong alkali, I think.  The second is to use primer and paint from the same manufacturer and from the same product family, information which the manufacturer should publish.

Google is your friend.  Or Bing if you swing that way.

73,
George
W5VPQ

---------- Original Message ----------
From: John Hutchins <olegerityincj at austin.rr.com>
To: Milsurplus at mailman.qth.net
Subject: [Milsurplus] Painting Aluminum - BC-348 in particular
Date: Thu, 13 May 2010 21:46:44 -0500

Group  -
Good evening -

The black wrinkle tex paint I applied many years ago never cured it 
remained soft/slightly sticky.  So I am removing the bad paing job and 
starting over.

That being said I noticed that there is a green chromate primer layer;  
Is this a paint or a immersion coating?


Thanks
Hutch
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