Re: Good coating for condensation protection?

From: John Larkin (jjlarkin_at_highSNIPlandTHIStechPLEASEnology.com)
Date: 12/29/04 

Date: Wed, 29 Dec 2004 15:35:32 -0800

On Wed, 29 Dec 2004 15:20:58 -0500, "Bill Stock" <Me7@Privacy.net>
wrote:

>I've got a temperature sensor circuit which is subject to severe
>condensation. What's a good protective coating? I was thinking of filling
>the enclosure with silicone caulk, but I imagine some spray coating might be
>better?
>
>

Most air-dry silicone caulk has acetic acid, which is bad news for
electronics.

Epoxy is good, or an acrylic casting compound. Use slow-set epoxy...
the fast stuff gets hot as it cures. The resin they use to fiberglass
boats is good and cheap. Mold-making (2-part) silicone is excellent.

For conformal coating, ordinary polyurethane varnish is pretty good.

John

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