three ways to attack-Marine tex putty with black color mixed in(they sell it from same co)- Acteone the base, Tape it off PERFECTLY, mix the two epoxy parts, put a tiny bit of black dye in it, mix it, then take like a tongue depressor and fill it in. Let it set up. then expect to sand it to match it. When you sand it the color wont match(wont be glossy finish) but itll be sealed and only you will care.Fiberglass shop for $150-200- wont even have to flip it. Cake job for the pros.Get gel coat from basscat and buy some 2,4 mekp hardener from wally world in car repair area and do it.- this one you gotta clean it with acetone, mix gel coat and catalyst, PERFECTLY TAPE, apply with bush, cover with wax paper, let it set up for hours and maybe a day, and repeat the process until its too tall. This one you can sand it down with some 800, 1000 wet, then maybe liquid polish by hand, then wax and probably get this one to shine and match fairly well but will take multiple apps and some trial and error on buffing it to color you want. Wont require any clear coat as black in BCB is just black.C.O.D. Jr. III