After practically memorizing the steps and equipment mentioned in this post, and buying a lot of it, I discovered that the used boat I bought might have been Awlgripped.
The deck is the original white gelcoat, but the hull is jet black. When I removed a transducer from the bottom, the ring around the hole, where the transducer lip was sealed to the hull, untouched by bottom paint, was shiny jet black. That might have indicated that black was the original factory color; but residue in the bilge where the transducer poked inside the hull indicated that the transducer I replace might have replaced an even older one -- so the hull might have been painted black before the current transducer was added.
Is there any way I can find out for sure it the black finish is Awlgrip?
I doubt very much that Awlgrip was used below the waterline. It is more likely that it is a thin-film bottom paint that was polished after application.