I have read a lot about conversions, I understand that leaving the frets unfilled weakens the neck, basically turning the neck into a piece of kerfing. Obviously, something needs to fill the slots to keep them from compressing under spring tension. I was wondering though, could they be filled with epoxy? I would like to have an epoxy coated fretboard, would there be a downside to leveling the fretboard with the appropriate radius block, then covering the fretboard with epoxy and filling the slots? I imagine it would be stronger than any wood I could put in there. Or would there be issues with shrinkage?