I have seen that in the past but mainly with 1B31 applied with a select coat system. In that case we changed out the tubing- it turns out that the tubing would allow for diffusion through the plastic tubing. I think the moisture absorption might occur in the spray lines. Might want to take a look at that or try spraying with nitrogen than air.

Tom

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Blair Hogg
Sent: Wednesday, August 29, 2012 10:04 AM
To: [log in to unmask]
Subject: EXTERNAL: [TN] Cloudy Conformal Coating

I'm hoping that Technetters can share some light on an issue that we occasionally experience here - we coat some of our boards with 1B73 conformal coating, for some we have a spary machine, others a sprayed by hand. 

Every so often we will process some board through coating and they will have a cloudy / milky appearance in the coating. We have been told previously that this happens when humidity is up, since our manual spray coating area is not in an air-conditioned environment. 

Anyone else ever have this problem? How did you fix it? 

Thanks,

Blair

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