same problem observed on moulding compound wick to the component's  
leads for PTH parts... (especially, cheap capacitor made in other  
side of the earth)--- if you test for the in coming part using the  
long leads - everything OK, the wick only take place near the body -  
where you try to reduce stand off and insert a bit deep into the  
hole... (if you look closely, it showed slightly demarcation on PTH  
solder joint--- but inside is non-wetting... hard to FA).

On Feb 8, 2018, at 7:11 AM, Stadem, Richard D 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.