Missed the oxidizing copper- Thanks Kite-
Unless you are in some unpleasant conditions the copper oxidation is not a problem. How do I know this you may ask? For a quick, practical answer look at your house wiring. Wire nuts are used in houses, buildings and anywhere else you have electrical wiring and the copper is exposed to air, even more so than this application. The exposed copper wire gets darker in color which is a small amount of oxidation, but thats it. The connection is still sound and good.
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