I’ve used Devcon for Many years. Yes, it may be slightly more forgiving of volume measurement than some others but if you want the best hardness, most clarity, slowest yellowing, and fewest epoxy disasters, why not use syringes to measure it? There are lots of ways to screw up a finish and after all the steps involved in getting to the topcoat stage, it’s particularly galling to screw that up and ruin a bunch of baits.
to be honest, epoxy is not my first choice for topcoating metal baits. I prefer moisture cured urethane like KBS or Dick Nite.