Is it smudging during the day, or before it dries?
I would try packing on carbon over the top, or do like Enkore does.. use a pencil and a brush instead of gel liner. I like Urban Decay 24/7 with a angled liner brush. Or give the gel liner a minute or two to set up before you apply it, kind of like you do with false eyelash glue.
Also use a base and don't put heavy creams/lotions on your eyes and see if that helps.