Mark,

I  strongly suggest you get a copy of the IPC Conformal Coatings  
handbook and read it (IPC-HDBK-830).
This is a case of gaining enough information to ask the right  
questions and, more importantly, understand the answers.
This a very complex subject!

David A. Douthit
Manager
LoCan LLC


On Mar 25, 2007, at 8:24 PM, Mark Eckert wrote:

> Does anyone have input on what coatings and finishes are best for  
> PCB's that
> have to withstand harsh environments.  Is this what a conformal  
> coating
> provides?  eg.  sea water air, high humidity, range is temp from  
> -50 - 130F.
>
> Thanks,
>
> Mark Eckert
> 4th Dimension PCB Design
> Sunrise, Florida
> http://www.pcb-design.com
>
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