I'd use paste flux in production if feasible. However, when running a fair
number of parts, you must stencil solder paste. Rework allows using anything
that works. Paste flux works as you describe to ensure ball/pad compliance
making all balls part of the "plane." Have to draw the line for solder
pasting at .8 mm and above. Below, go with flux for uBGA and very fine pitch
CSP's.

Earl Moon

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