Most always finish off the rods I build with Spar Urethane , far from the easiest part for me is scripting on a round blank , let alone unsanded , but have had moderate luck myself with the gel pens as mentioned (a lot of attempts and erasing involved) , once you get things just as you like , make sure the ink dries completely ( I let things sit overnight ) , then I will mask off around the script and spray a light coat of clear polyurethane over the script (helmsman spray bombs) and let that dry , kinda protects everything for the following 2-4 finish coats of spar with the brush , on the unsanded blanks I try to build up a base of clear before I script with the gel pen to fill in the spiral ridges a little , and like auto body work , being urethane you can generally wet sand imperfections after the fact and recoat . Unfortunately no idea how this would work or be compatible with epoxy (?) , maybe a spray coat of clear lacquer before you apply ???
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