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Make sure that foam is (a) closed foam versus open (i.e. won't hold water) AND (b) does not contact anything metal. If it contacts metal and gets wet, it will keep moisture on the metal which will corrode the metal eventually.
This is why crevices on cars and trucks are the first common places for rust to start. The water gets in, gets HELD there by obstructing material that prevents runoff or evaporation, and rusts the metal around it.
Of course, SSRs have so much PLASTIC . . .
Jim G
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