Though tattoos last a lifetime, sometimes the feelings attached to them do not. Rather than staring at a mistake we would not like to be reminded of it is better to just ink over them entirely with a cover up.
Full and half sleeves are especially effective at hiding any old tattoos you may have gotten when you were younger without sacrificing your appearance.
By being able to completely shade and fill in the whole portion of the arm, the tattoo artist is able to work around the old tattoo using a larger surface to convey your new piece. Old tribal arm bands or flames wrapped around your wrist often necessitate the need for full and half sleeves to fully conceal unwanted ink.
An emerging trend in cover up sleeves is utilizing negative space to create new images, by completely inking out large portions of your arms you are free to cover up any tattoos while still having a piece you can proud to show.
Full sleeves allow for a bigger canvas to place over old ink and more space to draw the eyes away from embarrassing mistakes.