https://dymax.com/products/equipment/light-curing-equipment/system- 
accessories/liquid-light-guides/light-guides/
you can easily control the flow if done properly at your sensitive  
location- just be careful not over cure coating - it will turn yellow  
and flaky...
jk
On Jan 25, 2021, at 8:06 PM, Yuan-chia Joyce Koo wrote:

> my question is how the conformal coat get into metal contact  
> internally (something must be sitting around for a while?).  UV  
> curable with proper lamp (special lamp machine) can control well to  
> limit coating flow (material characteristic plus lamp power and  
> geometry).  Application engineer of your coating supply might  
> provide you with recommendation (photo initiator absorption  
> spectrum must match with curing lamp. for example).  there are high  
> end of UV curing machine can be programmed to limited flow  
> (localized curing).  But that is extra step and cost you money for  
> sure.  those programmable curing  machine is not cheap either -  
> they are used for (a) dentist or medical application (b) optical  
> components as both coating or adhesive bonding.  IMHO.
> Doug might have better solutions - if you buy him Mountain Dew ;-).
> best of luck.
> jk
> On Jan 25, 2021, at 5:44 PM, Reyes, Angel LAM2 4429 wrote:
>
>> Hi Joyce
>>
>> I need to prevent contamination on field by humidity and salt  
>> moisture ingress across the SW leads (close 0.04" separation),  
>> issue is to have electrical conductivity or intermittence external  
>> between leads solder joint.
>>
>> Regards
>> Angel
>>
>>
>> -----Original Message-----
>> From: Yuan-chia Joyce Koo [mailto:[log in to unmask]]
>> Sent: Monday, January 25, 2021 2:13 PM
>> To: TechNet E-Mail Forum <[log in to unmask]>; Reyes, Angel LAM2 4429  
>> <[log in to unmask]>
>> Subject: Re: [TN] Conformal coating applied on SMT SW leads  
>> recommendation
>> Importance: High
>>
>> why your SW got open for conformal coat?  prototype?  module level?
>> just curious.
>> jk
>> On Jan 25, 2021, at 11:26 AM, Reyes, Angel LAM2 4429 wrote:
>>
>>> Hi all
>>>
>>> Any recommendation for conformal coating UV cure to be applied by
>>> robot on SMT SW leads, we tried DYMAX EMAX 99003 but did not work
>>> material migrate by capillarity inside SW and internal metal contact
>>> parts were electrical isolated
>>>
>>> Angel Reyes
>>> 619 661 4429