Steve,
In my experience they do.  We sometimes see the same thing, whether molded
rubber or molded vinyl.


Doug Pauls
Principal Materials and Process Engineer
Rockwell Collins

On Tue, Apr 14, 2015 at 11:21 AM, Steve Gregory <[log in to unmask]> wrote:

> Hi All,
>
> Just got some black ESD rubber masking boots for some blade terminals for a
> board that we dip in Humiseal 1A33, and noticed that there is shadowing
> around the base of the terminals like something was repelling the coating
> away from them, maybe some sort of mold release compound? Tried dipping
> without the boots and we don't see the shadow. I got the boots to keep the
> coating from getting on the terminals so that we weren't sitting there with
> a conformal coat removal pen cleaning the terminals up after we dipped the
> boards.
>
> I called the manufacturer of the boots and asked about the issue, and he
> said they would get back to me. Haven't heard anything yet. I'll try to get
> a picture that shows you what I'm talking about...
>
> Steve
>
> --
>
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