Do you mean they want NiAu on contact fingers and/or contact pads,
i presume, common enough design "mistake" .
Done it , conformals won't protect your beans from bath compositions;
i poured latex over all but the pads in questions
(you face a serious chore of fine shaving and polishing down to copper),
than replate , than peel all the latex off (multi's spot on would do),
clean .
Noo , you definitely do not gild over solder.
If you handle it with feel for stress/flex/esd/etc.,
yo may live to tell .
Steve will tell you all the spot plating kits,
if don't feel game to dip plate .
You may search some on http://www.riogrande.com too

paul

-----Original Message-----
From: Ralph Richart [mailto:[log in to unmask]]
Sent: Thursday, 8 June 2000 9:29
To: [log in to unmask]
Subject: [TN] Loaded board rework


Hello:

Our customer made a mistake on their print.  Instead of specifying
immersion gold, they specified Hot Air Solder Levelled.  Now they have
LOADED boards that they want to get immersion gold on.

Has anyone done this?  The questions I have off the top of my head are:
1. How do you protect the components from the immersion gold?  Would
conformal coat work?
2. Do you have to strip the solder first, or can you go gold over
solder?
3. What, if anything, would all this do to reliability?

Thanks for your help....

ralph richart

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