Oh...sorry, caught somelthing in yer post--silicone. Don't use the regular variety. Emits acetic acid as it cures, rusts all kindsa crazy. Use "electronic grade" silicone to ensure an acid-free seal.
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Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein