Lures and flies must be perfectly dry before coloring.  Wipe any oil off soft plastics before trying to color.  For better coloring, wash soft plastics in dish washing detergent first.

Some of the Oriental Dollar stores in area malls have a like of knock off "Sharpies" that they call "Skerpies" for $3 for about a dozen different colors.  Handy to keep in your tackle box or on your fly tying bench.

Life is too short to catch little fish.

 http://www.panhandlefishingbooks.com/