Clamp a jig into your vise and turn it so that it lies horizontally. Find a set of drill bits or a couple of finishing nails and size up their diameters to the size of your jig eye. Dip a chosen bit or nail into some craft acrylic paint and dot your eyes. Let them dry for at least 1 hour.
Next, obtain a 25 ml syringe of Devcon 2 Ton Epoxy (D2T). Your jigs are large, so mix a line of both resin and hardener inside the bottom of an empty soft drink can. It's perfect for this use since its base is concave. Just flip the can over and squeeze out the line from edge to edge. Mix thoroughly with the tube's mixing stick. Do it slowly to keep the amount of air bubbles to a minimum.
Brush the epoxy mix onto your jig with a cheap Nylon kid's paint brush from a craft store. Rotate your jig in the vise as you brush. The epoxy will self level and you'll be able to brush away any obvious air bubbles. Working time is around 10-15 minutes until the epoxy begins to set up. Keep rotating the jig during this time to prevent any epoxy from sagging. Remove the jig from the vise after 1-2 hours and hang it for at least 6 more.
D2T is durable. I've cast jigs coated with it at bridge abutments with impunity and, although D2T scuffs, it takes a repeated pounding effort to shred or crack the finish.