>And of course water won't bother the fiberglass...

No but ..................

typically for PCB's assembled for use in space, where every solder joint is
getting a visual inspection etc, we specify that the bare PCB be baked for
several hours (typically overnight) at 50C immediately prior to soldering.
This is to free the epoxy of any water content, as moisture will cool the
solder as it flows through a plated through hole, and causes the solder to
go into its pasty, not quite hot enough, won't wet the copper mode. In this
situation you are required to suck the solder out and remake the joint,
which counts as a rework, and with a maximum of 3 reworks to a component
joint, this is highly non-desirable (what were we saying about English as
she is spoke in another thread?).

Yes, water does not bother fibreglass, in that it will not cause
degradation, but it does affect its solderability properties (and I'm sure
someone like RF Jim will tell you that moisture in it will affect its RF
properties).

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