I have no input about "once cured" but we do encapsulation and coatings, 
etc.... and for air removal during encapsulation we place freshly 
encapsulated assemblies in vacuum chamber for 1 1/2 - 2 minutes to remove 
trapped air from inside encapsulated assemblies.  This often brings the air 
to the surface.  To remove bubbles from surface before placing in the oven, 
we spray with denatured alcohol to help surfaced bubbles disappear before 
curing.  we use a simple spray bottle for application.  Once cured it is 
what it is for us.
Lenny ERG  www.ergpower.com


----- Original Message ----- 
From: "Ken Bloomquist" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, June 02, 2008 12:26 PM
Subject: [TN] Tiny Bubbles


> Happy Monday All,
>
> This has nothing to do with the ISS or Lawrence Welk :-)
>
> On occasion we get tiny bubbles in our moisture cure, polyurethane 
> conformal
> coating. We know that if the humidity is high (seldom happens here in
> Western Washington) and you get the coating on a little thick the bubbles
> will form. I'm sure the coating skins over really fast in high humidity 
> and
> then all those little volatiles can't get out creating tiny bubbles.
>
> My question is, are there any methods for removing these little bubbles 
> once
> the coating is cured? Generally they are not bad enough to need rework but
> on occasion there are just too many to ignore.
>
> Thanks as usual for any help,
>
> KennyB
>
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