Not sure if there are flux spray heads that can spray that selectively. I had wished that the pick/place machines could do that for me so I can spray tacky flux on flip chips and CSPs prior to placement without having solder paste on those pads.
However, a properly designed pallet can protect the rest of the bottom of the CCA but leave those target pins exposed, then they can be selectively fluxed and selectively soldered with a selective solder machine, or spray-fluxed and wave soldered. Run the pallet through the machine wash (minus the CCA) and they can be re-used right away.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tom Burek
Sent: Tuesday, December 14, 2010 11:07 AM
To: [log in to unmask]
Subject: [TN] No-Clean flux with a Wave pallet

Season Greetings All,
In the opinion of all the experts out there, are there any issues I need 
to be aware of in using a No-Clean flux while using a wave pallet?
I am trying to wave solder some through hole pins on a SMT assembly 
(populated 2 sides).
Are there flux spray heads that can limit the flux to the exposed pins in 
the wave pallet?
How often do the wave pallets need to be cleaned between each run?
I would be most interested in any stories of disaster or success on this 
issue.

Thank you in advance and Best wishes to all for a prosperous New Year.


Tom Burek, CID+
Ametek/VIS



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