Well;
The black is actually from the primer coatings from the cap section taping in phase one.
Look carefully at the bottom of the cap section meeting with the deck.
There is a U shaped molding encapsulating the bottom section of the cap/locker section separating the cap and deck fiberglass sections.
The molding has been crushed in some areas and was remedied by slicing the whole lip section off with my fateful cutting wheel;
Leaving a clean and workable surface..
Ready for a makeover.