im so sorry, I did promise to reveal my secret but I thought nobody was interested, plus my tuna trip was a bust (small yellowfin and a b unchecking of skipjack).
The trick is I use clear heat shrink slightly larger than the circumference of the rod to cover the entire decal, but first I treat the inside of the heat shrink with mirror glaze, using a pencil or something similar I coat the entire inside of the tube ( dosen't have to be super thick but must coat the whole thing), set the tubing off to the side and let dry completely, maybe at least a couple of hours.Then I wipe off the wax film from the inside of the tube with clean paper towels, as I'm pushing the paper towels through the tubing I change paper towels frequently so no crap is left behind. ARE YOU STILL WITH ME? some times it seems tedious but it's the small details that can put your labels over the top.in some cases I find a coat hanger works when pushing sometimes small pieces of CLEAN paper towel inside the tubing ,but make sure not to scratch the inside of the tubing. this process will prevent any epoxy from adhering to the tubing, also it will give a glass finish to your label, the thing is it all comes down to how well you prep the heat shrink, iv'e done a few coats at times, I lay down the decal and squeegee all bubbles out, if you see small spots where you can't push a bubble to the edge poke the spot with something sharp, I don't mean sharp like a pin or nail, I mean sharp like a 27 gauge insulin syringe, it will allow air to escape, when your satisfied with your label cover the label and that part of the rod with a thin coat of epoxy, not too thin, make sure it covers completely and as rod is turning wipe off any excess epoxy that may ooze out of the edges as the tubing shrinks, of course I begin heating the tube from the center and work my way out, use only the heat needed ,some times I just use a common blow dryer and not a heat gun .I let dry for at least 36 hours just to be sure its dry, using a sharp or new razor blade I barely score the tubing so I can start peeling the tubing off,do not cut the tubing all the way through, just enough to keep it peeling, as good as it looks I apply another coat of Finish over the entire area for an absolutely beautiful job. I also have a technique where I use adhesive lamination sheets and a laser printer to make decals with a regular computer, this way I have all the font and size options a computer has to offer, the best thing is the print is on the side with the adhesive, the kid at kinko's watched me do this and was speechless. I didn't just happen upon this, nobody showed me any of this, everything that I say not to do, I've done, every shortcut ive tried ended up costing me , not only money but the most precious resource of all, TIME. in the navy we learned that there's never enough time to do it right, but there's always enough time to do it over.