I'm one of the believers in a nice tidy logbook. I beleive in one color, ink only... no pencil, and if there is an error, draw the single line through the offending number and correct it with a one line entry on the current working page.
The people that interview you will use your logbook as a representation of the kind of work you do. If they see 2 different colors of ink, pencil, and a ton of white out, it shows a track history that is indicative of how you will complete company work.
Neat and clean, the occosional correction that shows you audit your work and are not afraid to correct mistakes is the way to go.