Yep, sounds like humidity or maybe solvent left in the sprayer. I had this
happen when somebody rinsed the sprayer with water. Really ugly. I fixed it
by baking the moisture out and then spraying a fine mist of thinner followed
by a bake at 180F for 2 Hr.

-----Original Message-----
From: Ingemar Hernefjord [mailto:[log in to unmask]] 
Sent: Thursday, 27 October 2005 9:32 AM
To: [log in to unmask]
Subject: [TN] Urgent! Acrylic coating

Hi all,
I got a call from our production. They stopped the board coating. All
boards get white and superthin veils, patterned like fractals or roses.
I'm at home because of illness, so I can't participate in their work
with the problem.
I asked them for how long they bake the board before spraying, and they
told me that  no baking is made at all. Does sound wrong to me. My first
theory is humidity in some form. Humiseal, don't have the article number
just now.
Anyone who has a tip?
I'll get pics sooner, maybe I can resize them for Steve's gallery.
Thanks in advance
Ingemar Hernefjord
Ericsson Microwave Systems

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