I have used Scotch electric sealer (comes in liquid brush on form). Works
ok; very hard to get off later.
used nothing, screws rusted within one year.
used sillycone windshield sealer; preserves gud, very very hard to get
used Krylon clear spray; a little rust after three years, hard to tell
where it is for later scraping and re-connecting of wires.
U gotta use sompthin, cause rust is your alternative.
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