What you can do is use the CSI Quick Coat lure markers, they use paint not ink like a sharpie. When I use them to make dots or small marks on a lure I do it this way, I power coat my jig, then make the marks I want and cure in my toaster oven at 350 for 15 minutes. The nice thing about those Quick coat markers is the paint takes the heat so when I use my powder painted jig with the marks on them, it bakes right in to the powder finish and so the paint will chip before the dots or marks you make will come off. If the jigs you have are already cured then simply make your marks and coat with Devcon 2-Ton epoxy, the 30 minute and not the 5, the fast cure epoxy isn't too clear when it cures.