Sounds like excess activator and maybe excess handling as well. The activator
has some solvency so if there are any handling soils on the board it will
partially dissolve them before flashing off ... changing what was glossy and
therefore invisible to a matt and highly visible residue.
To reclaim the boards try brushing with regular IPA or wave solder flux
thinner, or maybe a proprietary aerosol cleaner all of  which should get it
off easily enough.

Mike Fenner



In a message dated 01/06/99 22:31:41 GMT Daylight Time, [log in to unmask]
writes:

> ----- Original Message -----
>  From: Tempea, Ioan <[log in to unmask]>
>  To: <[log in to unmask]>
>  Sent: Tuesday, June 01, 1999 7:22 PM
>  Subject: [TN] Fingerprints
>
>
> Hello,
>  >
>  Here's a good one!
>
>  The boards one of our touch-up ladies is doing ECOs on started making
>  fingerprints appear after applying the wire bonding glue.
>  That is, once the small glue dots are cured, all around them and in the
>  adjoining areas, a white stuff, like baby powder, is appearing, making
>  wide
>  bands where the fingerprints show.
>
>  Did anyone else experienced this? I assume it's a reaction between the
>  perspiration and the glue. Is there any way to fix it, except gloves?
>  > The glue is Loctite 382. Is it the only troublemaking glue?

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