Homebrew PCBs

Speaking of puddling...

I have a syringe of SYNtech paste, specifically because it doesn't
need to be refrigerated.  I've got a bit of old wire insulation to cap
the end (the insulation is itself plugged, so no air gets in).  It's
been sitting on my bench for over a year and half now, in sporadic
use, and still works like when I got it.  Puddles when warmed, though,
so unless you've got a precise mask (i.e. no excess paste) there's not
a lot of point in being too careful.

The grind is pretty good, too - solder particles are too small to be
individually discernable.