Silicone lube comes in a spray can, not a jar. Disassemble the cube completely. wash and towel dry, then lightly coat with the can. make sure it is 100% silicone. WD40 rots cubes, as does vasseline.
Leave cubies to dry for about 20 mins, then roll them in a dry towel to get rid of most of the excess. After that it's best to leave them in a dry non-dusty place to dry fully, preferably overnight.
Reassemble, then wipe the outside of the cube until it's clean. You may get slight traces on your hands after use for the first couple of weeks or so, after that, it'll be fine.
Lubing will not make your cube cut corners. That's down to the initial tightness of the cube (adjustable on most, not on rubiks storeboughts though), curviness of the cubies (more rounded cubes cut better) and skill of the cuber to guestimate when to turn.
Please take off topic discussion off this forum. Thanks.