Totally agree with rlise!
I'm a klutz and could NEVER do a liquid eyeliner without making a mess.
So I tried pencil liners, but they tend to smudge and it was really frustrating!
I purchase Benefit She Laq a few months ago, it's a make up sealer (around $24?), and you can apply a very small amount over your eyeliner to prevent smudging.
This worked very well for me, until I found MAC fluidline, and man, it's so foolproof that it's the best solution I've found so far!