Pack the Wheel Bearings Failure

first time I used a double cone pressurized one in high school auto shop (!) , I watched the black crap ooze out and then the new green stuff follow it. We knew it was purged of the old gunk.
Buddy worked for Parker-Hanifin in the test department. Skydrol is a **** when it gets on you. Gloves were mandatory as well as a full face shield and apron. He worked in the hydraulic actuator test area (F-18, Tomahawk stuff) where actuators would blow up every now and then, always in a fully contained "boom box". Petroleum products are nasty for the skin, unless they are made for it, ie. Vaseline.