I've been watching this one and waiting for some one to mention what bit me
on immersion tin, a pcb vendor with poor process control. The folks who made
the process helped me solve the problem I was having, i.e. non-existent
solderability after re-flow. The PCB vendor (no longer getting PO's) was
putting the tin down at 1/10 the recommended thickness. A couple of months
on the shelf, a trip through our re-flow oven and.... my customer could not
solder the assembly to their pcb. So from my corner of the world a qualified
pcb vendor is the most important factor in shelf life.
BTW the only reason I would consider immersion tin again is the great
service and above and beyond the call service I received from the process
manufacturer.

Dan

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