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Failures like that can be hard to diagnose but my guess is that some part of your finish absorbed water and pushed the finish off the bait. Perhaps the DN moisture cured urethane did not soak through the other finish coats down to the undercoat as it usually does, leaving an element of the underlying finish vulnerable to water absorption. Most of us use some kind of a "Devil's Brew" of finishes so it's impossible to predict which combinations of coatings will work until we try them. One reason a thick epoxy topcoat is popular on musky baits is that prevents teeth from ever penetrating to the underlying finish layers. If water never gets below the topcoat, the finish will never delaminate.