Originally Posted by chuck s
Have you considered that the slipping of the coating from the core was a fluke? I've never encountered this and for years used the nail or similar knots.
That actually happen to me once while striper fishing at night. A nice fish pulled the leader right off.
My flashlight was nearly dead, so the only way I could think of to keep fishing was to strip off more of the line coating and tie a perfection loop in the core. It worked so well that I left it that way for the rest of the season