Yes, you don't want to spray warm boards for the same solvent escape reasons.

I think Inge's original email had the part number cut off but if it's 1B12, having the boards sit for at least a 1/2 hour before hitting them with any heat, would be a good starting point.

-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]] 
Sent: Thursday, August 20, 2009 12:00 PM
To: [log in to unmask]
Subject: Re: [TN] Manual spraying

Inge,

When I was first setting up our hand spray process I found that if the boards were still too warm (hot) from the pre-coating bake cycle that I would get lots of bubbles in the coating.  When the boards were allowed to cool sufficiently before coating these bubbles did not appear.

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Thursday, August 20, 2009 2:18 PM
To: [log in to unmask]
Subject: [TN] Manual spraying

Good Evening,
we use small cans filled with 1B1 conformal coating for handspraying boards.
The guys are not satisfied with the result, because sometimes the result is
matte. Microscope photos show thousands of microscopic bubbles in the
coating. I suspect that it's included driving gas. Or wrong handling the
spray can.Anyone out there with experience? How do you avoid this problem?
/Inge

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