FujiFilm WP-FZX100 Owner's Manual page 55

Maintenance
5
Coat the O-ring with the special grease.
6
Install the front-side O-ring (white).
O-ring (white) O-ring (white)
EN-23
To apply a uniformly thin layer of
silicone grease to the O-ring, squeeze
out about 5 mm (0.2 in.) length of
the grease provided with this product
from the tube into a clean plastic
bag (about 10 cm (3.9 in.) × 20 cm
(7.9 in.) in size) and then knead it
thoroughly. Put the O-ring into the
plastic bag and continue kneading
until the O-ring is completely covered
with grease. The plastic bag can be
used more than once if kept clean.
For correct installation, observe the
sticker (white) inside the waterproof
case.
Place the front-side O-ring on the
waterproof case beforehand to
confirm that the O-ring is not twisted.
If it is not twisted, make sure that
it is clean, with no foreign particles
embedded in it or dust stuck to it,
before installing it.