Homebrew PCBs

On Fri, 20 Nov 2009 09:45:25 -0000, you wrote:

>----- Original Message ----- 
>From: "multidigital15" <jboavida@...>
>To: <Homebrew_PCBs@yahoogroups.com>
>Sent: Friday, November 20, 2009 9:42 AM
>Subject: [Homebrew_PCBs] Coating: Acrylic or Silicone based?
>
>
>> Hi,
>>
>> I have some PCB's in a place with a lot of moisture (basically the system 
>> is on the top of a small moutain around 1000 meters above sea level).
>>
>> Normally I use Kontak Chemie's Plastik 70 to protect my PCB's, but in this 
>> case it does not work. Yesterday in a preventive maintenance I had found 
>> that the PCB tracks are almost gone with corrosion.
>>
>> I need advice how to protect the PCB's in this environment. I had see that 
>> acrylic and silicone based coating products exist on the market. I guess 
>> silicone based are better for  this applications, but I'm not sure. Can 
>> anyone advise some produts to better solve this problem?
>
>Conformal coating?
>
>Leon 
>
About 30 years ago Gilbarco/Exxon used conformal coating for all the PCBs in their gas pumps and
consoles. Never saw a single corrosion problem in the coated area from the field. BTW - They made
the majority of world's gas pumps back then, so the sample size was rather large.  Repairing a board
after coating was a real adventure.
Keith Bowers WB4LSJ- Thomasville, NC