Sounds like some form of contaminant on the plugs. silicone will do it and oils will also cause epoxy to react that way. Found this out the hard way with all the rods I've built over the years. It may not even have been something you did but a family member cleaning or working on a toy.One time it was the cat after eating some tuna. Sneezed near one of the wraps. Whole rod came out great but that one wrap. My son reminded me of the cat. Ron
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