depend upon your layout and routing path as well as your operation  
environment... if you have ground plane extended to the edge, you  
might need to coat.  if you have high humidity operating environment  
or corrosive environment that may react with the lamination, you need  
to coat... IMHO. (if it is high voltage, 12 V for example, I prefer  
coated... it might operated at high temp and got temperature cycled a  
lot if power on/off).
On Mar 1, 2018, at 10:45 AM, Caitlen Gahm wrote:

> Greetings,
>
> We are wondering what the general thought is regarding whether or  
> not the edge of a CCA/PWB needs to be conformally coated?  We  
> received CCA's from a supplier and noticed that the edges were not  
> coated.  Our thinking thus far is that since our drawing does not  
> state that coating on the edge is optional or not required, it  
> would be required.
>
> What we are curious to know is what the general consensus is  
> regarding whether or not it is necessary to coat the edge of the  
> CCA and instances when this would or would not be desired.
>
> Thank you,
> Caitlen Gahm
> Materials and Process Engineer
> Crane Aerospace & Electronics