Homebrew PCBs

What's a good thing to coat my built boards with, to protect them from
the environment?  I've got a temperature/humidity sensor outdoors on a
small pcb, but I just got done cleaning some corrosion off it.  Epoxy?
Spray paint?

I have a spray can of silicone conformal coating at work, that stuff
is really great because it will hold up to some temperature and high
voltage, and it's also flexible so it won't crack.

If it's just about corrosion, acrylic paint will do. I have dipped the
PCB of my satellite dish rotor in a can of clear acrylic paint
(water/ammonia solvent) and it worked fine.

The strongest is probably epoxy potting, horrible when i need to
remove the potting for fault identification. Only do this if you are
positive you never need to access the circuit again.

Don't forget to cover the humidity sensor, or i predict a very dry
climate for the coming year ;-)

ST

On Wed, Dec 31, 2008 at 5:49 PM, DJ Delorie <dj@...> wrote:
>
> What's a good thing to coat my built boards with, to protect them from
> the environment?  I've got a temperature/humidity sensor outdoors on a
> small pcb, but I just got done cleaning some corrosion off it.  Epoxy?
> Spray paint?
>

----- Original Message ----- 

From: "DJ Delorie" <dj@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, December 31, 2008 4:49 PM
Subject: [Homebrew_PCBs] pcb anti-environment coating?


> 
> What's a good thing to coat my built boards with, to protect them from
> the environment?  I've got a temperature/humidity sensor outdoors on a
> small pcb, but I just got done cleaning some corrosion off it.  Epoxy?
> Spray paint?

Conformal coating?

Leon