Seam Repair 

You could just use thickened epoxy

Looking for this answer too

might be apoxy with black pigment, so they can polish at the end

Stealth Kayaks thanks

Black is gel coat thickened

Hahah yeah, I won't be sending mine to sipo, rather fix it myself

Haha. I'm no tradesman( a butcher) and thought the very same thing. I expected them to spray it and also sand it between coats. They didn't even sand it after the last angle grinder sanding disk chomped into it. Did you notice the other workers in the shed, none had a mask on . They must all believe that fiberglass drops to the ground without any getting airborne.