It's called a water resistant housing for a reason. Since the hole still exists in the shaft. It's only protected from water by a grease layer. Which ...
Underwater robotics and aquatics can be very fun. Technically small motors will work okay in submerged in water. But let's be honest. Nobody likes maintenance after every use. This instruct able will be a guideline to constructing a water resistant case to better protect the motor and cut down in maintenance. And can be made with relatively few bought materials if you already own the majority of these tools.
Step 1: Supplies
The following supplies are not hard to find and can be purchased at most auto parts stores and department stores.
Ã¢ÂÂ¢bottle (old film can or prescription container)
Ã¢ÂÂ¢dremel (with assorted bits and tools if required
Ã¢ÂÂ¢hot glue gun
Ã¢ÂÂ¢old motor gear.