[Antennas] Metalic Reactions?

[Mr. K. Rudolph, KD7JYK]

Years ago I had some Willard Lead Acid batteries.  They had lead terminals
on top.  I used brass screws to secure wires to these.  After a short amount
of time some sort of reaction took place and the screws literally turned to
blue putty, then began to ooze.  What was once a 10-32 x 3/8 brass screw
became a two inch long blue oozy mess coming out of the holes in the
terminals!  What happened here?

The reason for my question:

I need to fill two holes in aluminum.  The holes are threaded, so I will
most likely use a plug or screw of some sort.  This will be exposed to the
weather 24/7, in a damp dirty location.  I can protect things in general
with a coat of paint, but what can I use that will not react to Al?  Is
brass and aluminum compatable?

Kurt

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Ross Technologies Signals Intelligence Division
Rosetta Proving Grounds