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From: "Bob Paddock (graceindustries AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Thu, 16 Feb 2017 08:37:46 -0500
Message-ID: <CAOuGh89ZD1DbEUM7WV7bvYxiNNHCxCjseAtzcHEtoHWgp0t2XA@mail.gmail.com>
Subject: Re: [geda-user] [Offtopic] Application of silicone based conformal coatings?
To: geda-user AT delorie DOT com
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On Thu, Feb 16, 2017 at 4:38 AM, Peter Clifton
(petercjclifton AT googlemail DOT com) [via geda-user AT delorie DOT com]
<geda-user AT delorie DOT com> wrote:
>  Hi all,
>
> I bought some Dow Corning silicone based conformal coating


Do you have access to a clean paint spray gun?
Preferably driven by an oil free air stream,

There is some discussion of coatings in December 2008 of the old list archives,
where I wrote this, which is worth repeating:


   "A very common misconception is that Conformal Coating is a Hermetic
   Seal.    It is used a lot in the Coal Mines, and the Electronic Industry in
   general,   to keep the caustic dust off circuit boards.

   As Conformal Coating is not a hermetic seal, what real happens is the
   impurities in the water are kept away from the circuit, but the water
   itself reaches the traces [eventually]. Since the water is now
fairly devoid of
   contaminates the water acts more like a dielectric insulator. You
   never notice it in a low impedance digital circuit, but unless
   debugging is an obsession don't let it get near a RF tuning circuit or
   a high impedance circuit."

http://archives.seul.org/geda/user/Dec-2008/msg00324.html