Yup  Real common for  unsealed connectors. 



You either have to find a better masking solution (often not possible) and/ or use  multiple layers of a highly atomized  (dry ) spray that is not very mobile  when it hits  the PCBA. 



Some unsealed  ZIF connector styles where the requirement is coat the leads but contacts are all KOZ are really a problem  for me due to capillary action of the coating if still wet when it hits the PCBA. 







Rich  Kraszewski 

Senior Staff Process Engineer

Plexus Engineering Solutions 

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-----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.