Depending on the Tg of the coating material it can also "cold flow" into sockets and onto pins!

Sent from my iPad

> On Feb 8, 2018, at 4:11 AM, Stadem, Richard D <[log in to unmask]> wrote:
> 
> Yes, that is a common occurrence and is one reason why many connectors are exempt from coating. Conformal coating's capillary action is incredible. It will seep into any and all space available, and once in there and cured, will insulate the surfaces covered.
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
> Sent: Wednesday, February 07, 2018 4:17 PM
> To: [log in to unmask]
> Subject: Re: [TN] IPC-CC-830 (Conformal Coat)
> 
> sorry for the long delay (and thank you for the responses) but as I was reviewing these posts I had another question:
> 
> Have you ever heard of problems with conformal coating material wicking up the connector leads and causing intermittent connections?
> 
> thanks again,
> Jack
> 
> 
> On Wed, 6 Dec 2017 14:09:46 -0500, lduso - Diamond-MT.com <[log in to unmask]> wrote:
> 
> (..snip...)
>> It's up to me to decide how close to J1 to get with the coating. I once 
>> coated the leads of all the fine-pitch connectors and the customer said 
>> that was too close. The next customer will reject the work if I don't 
>> coat the leads.