Ben,
It might be the brushes themselves. Many brushes are shipped with a mild
wax on the bristles to help them keep the shape during shipping. We
always require our operators to solvent clean the bristles on new brushes
before their first use.
Doug Pauls
From: "Gumpert, Ben" <[log in to unmask]>
To: <[log in to unmask]>
Date: 10/04/2012 10:26 AM
Subject: Re: [TN] EXTERNAL: Re: [TN] UV40 Conformal Coating
Sent by: TechNet <[log in to unmask]>
Lee,
Our preferred method of application is automated spray, we are just
performing some initial testing with brush application.
Do you expect that I'll see a dramatic difference between the two
applications? I typically do with a solvent based coating, since the spray
process results in the loss of solvents, but with this material I'm not
sure that there will be much change.
Ben
-----Original Message-----
From: lee Hitchens [mailto:[log in to unmask]]
Sent: Thursday, October 04, 2012 7:57 AM
To: 'TechNet E-Mail Forum'; Gumpert, Ben
Subject: RE: [TN] EXTERNAL: Re: [TN] UV40 Conformal Coating
Hi Phil
Is this going to be your preferred application method or are you just
evaluating it with the brush for initial trials?
Best Regards
Lee Hitchens
Technical Director
SCH Technologies is a Division of SCH Services Limited
Mob: +44 (0) 7862 25 33 21 www.conformalcoating.co.uk
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
Sent: 04 October 2012 12:46
To: [log in to unmask]
Subject: Re: [TN] EXTERNAL: Re: [TN] UV40 Conformal Coating
Lee, Phil,
I typically use urethane coating, so I am used to something that thickens
up during application, so this is certainly different than what I am used
to.
What I've tried so far is hand application using a brush, and I see the
dewetting happening on vertical lead areas, like the legs of gull-wings.
And it's happening almost right away, before I go to cure.
I'm using some dummy test boards, but they've been through an in-line
cleaner (Kyzen A4625) post soldering, and a hand clean with IPA just prior
to coating.
Ben
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Kinner
Sent: Wednesday, October 03, 2012 5:10 PM
To: [log in to unmask]
Subject: EXTERNAL: Re: [TN] UV40 Conformal Coating
Hi Ben,
How are you applying the material and what components are you seeing this
on?
There are some application tricks to the trade to minimize this
phenomenon.... You can contact me offline if you'd like to discuss this
further.
Otherwise, I'd recommend you speak to both Matt Eveline at HumiSeal and
Jon Urquhart at PVA, both great resources to get you going in the right
direction.
Best Regards,
Phil
+44 7703 795422
Sent from my iPhone
On 3 Oct 2012, at 22:47, Lee Hitchens <[log in to unmask]>
wrote:
> Hi Ben what are you comparing too? A solvent based coating or
> something
else! Is the coating running during or just after application or during
the cure process under the uv lights where it can get hot?
>
> Best regards
>
> Lee hitchens
>
> Sent from my iPad
>
> On 3 Oct 2012, at 21:39, "Gumpert, Ben" <[log in to unmask]> wrote:
>
>> Technetters,
>>
>> I'm evaluating Humiseal's UV40 conformal coating, but I'm seeing
>> wetting
issues - where the coating completely runs off of vertical lead surfaces.
>>
>> I see from some e-mails a couple of years ago that some of you are
>> using
this coating material, or were looking into it. Is anyone else seeing this
problem, or have some suggestions to fix?
>>
>> Ben
>>
>>
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