In a previous life with a contract manufacturer that did a class 3
automotive, we routinely coated over no clean residues with few or any
issues.  I never felt comfortable with that however and am very glad to
be cleaning our no-clean presently.  You do wind up getting areas that
are quasi- coated with a CC & Flux -residue blend of some type.  I
suspect that perhaps that SR coatings may be more forgiving along this
line.  If I were a coating manufacturer however, I would contest any
claim of defective coating with the fact that you don't have "our CC" in
that failed spot(S). 

Rich Kraszewski

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ken Bloomquist
Sent: Thursday, March 04, 2010 11:20 AM
To: [log in to unmask]
Subject: [TN] Conformal Coat Over No-Clean Flux

We have a twelve leaded, through-hole component that has to be hand
soldered
on the circuit board. The assembly gets conformal coated with urethane.
We
would like to hand solder these twelve leads using no-clean and then
conformal coat the board. The component would be added as a final step
after
the assembly has first been cleaned.

Since this is not a "total no-clean" process do you see any issues
applying
conformal coat over these twelve no-clean solder joints?

Best regards,

KennyB


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