Hi Kenny
Is this a new product or an old one that has only now exhibited tis
problem?
Looking at the photo, I suspect the problem is related to the
reflective UV.
A suggestion, try warming the assembly to around 40DegC then spray
apply the coating. This "trick" can often overcome these issues
because the warmth of the assembly drives off the solvent faster than
the de-wetting forces. Don't make the assembly too hot, or you can
induce bubbles in the coating.
Hope this helps
Kindest regards
Graham Naisbitt
[log in to unmask]
Phone: +44 (0)12 5252 1500
Mobile: +44 (0) 79 6858 2121
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On 22 Jun 2006, at 18:38, Bloomquist, Ken wrote:
> I've had Steve post a picture of the missing coating on the via's. I
> hope this helps make things a little clearer. A picture's worth...
>
> http://stevezeva.homestead.com/files/Via_Coating_Dewetting.JPG
>
> Thanks Steve for posting this picture.
>
> KennyB
>
> -----Original Message-----
> From: Bloomquist, Ken [mailto:[log in to unmask]]
> Sent: Thursday, June 22, 2006 9:44 AM
> To: [log in to unmask]
> Subject: Re: [TN] Conformal Coat Voids
>
> Hi Ramon,
>
> These voids have nothing to do with Kapton tape or silicone backed
> adhesives. These are via's that are tiny and out in the middle of the
> board. There is nothing else around them that is masked. The lack of
> coating is only on the domed portion of the solder that is in the via
> which protrudes slightly above the board surface. I'll try to get a
> picture of the condition if the camera can pick up the black light.
>
> Thanks,
>
> KennyB
>
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