Stanley makes a small finger plane that works very well for just this sort of problem. I make sure when glassing that there are no runs or sags... makes the final sanding MUCH easier but occasionally, usually when the shops a tad cold, a run or two will show up. If the epoxy is still green I use a very sharp chisel and remove the drip. If the epoxy has fully hardened I use the small hand plane. It's easy to control, razor sharp, and removes the drip or sag with just a few effortless passes of the plane. Remember, the less sanding of epoxy you have to do the better off you are both financially (sandpaper is spendy even in lots of 100) and health wise. Doug