Hi to all,

Has anyone ever dealt with a "water like" staining pattern on solder mask
surfaces processed through HASL?  We suspect the SM cure cycle since
rebaking the boards makes the stains disappear.  The stains seem to be
within the solder mask (Probimer 77) and only appear after the HASL line.
It also seems to hit high heat mass boards worse.

Denis Dionne
Coretec

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