GoPro HERO 4 Black User Manual page 80

/ Camera Housing
PREVENTING WATER DAMAGE TO YOUR CAMERA
The rubber seal that lines the camera housing forms a waterproof barrier
that protects your HERO4 Black in wet and underwater conditions.
Keep the camera housing's rubber seal clean. A single hair or grain of
sand can cause a leak and damage your camera.
After every use in salt water, rinse the outside of the camera housing
with non-salt water and dry. Not doing this can eventually cause
corrosion of the hinge pin and salt buildup in the seal, which can
cause failure.
To clean the seal, rinse in fresh water and shake dry (drying with a
cloth may cause lint to compromise the seal). Re-install the seal into
the grooves in the backdoor of the camera housing.
WARNING: Failure to follow these steps each time you use
your GoPro can result in leaks that may damage or destroy your
camera. Water will damage both the camera and the battery,
which could cause an explosion or fire. Your warranty does not
cover water damage resulting from user error.
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