Are polulu Micro Metal Gearmotors waterproof?

As one who used those motors - I am almost sure that they aren’t. Unlike non-micro metal gearmotors the gearbox is completely exposed to air. Even if you would use the brackets Pololu provide for those motors which cover the gearbox (items #1086 and #1089), they are made of plastic with no apparent sealing against water. In addition, their terminals are also completely exposed.

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None of our gearmotors are designed to be waterproof.