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Of course they can... you could do that same thing on any surface through which air travels, though. You don't see everyone coating their screen doors and windows with catalyst, do you?
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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