[Milsurplus] Painting Aluminum - BC-348 in particular

[J. Forster]

> 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.

Sodium or Potassium Hydroxide will etch the surface of aluminum to a matte
finish, helping the paint adhere.

-John

================

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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