Re: Good coating for condensation protection?

From: Bill Stock (Me7_at_Privacy.net)
Date: 12/30/04 

Date: Wed, 29 Dec 2004 19:44:13 -0500

"John Larkin" <jjlarkin@highSNIPlandTHIStechPLEASEnology.com> wrote in
message news:khf6t0h7a8oa2d1429gnt2spcu4f29lqcr@4ax.com...
> 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
>

Thanks John,

Epoxy seems to be the favourite. Although I imagine repairs would be a
bitch.

How do you find the drying time for a polyurethane dip? I think it would
take a while to harden? Do you favour any particular brand?

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