A perfectly circular crack in the the center (athwartships) of the splashwell gelcoat turned out to be a "phantom" drain that had been drilled for but then simply filled and gelcoated over, presumably at the builder or dealers. Subsequent conversation supplied me with the info that the center location was typically used for twins (my boat has two engines, but not twins). This type of "repair" (just filler and gelcoat) is destined to crack, which it had. I ground it back in a taper to prepare for adding fiberglass cloth. Actually here I had taken away too much of the fiberglass (pink bits) and so ultimately I increased the diameter and improved the taper (leaving more glass to bond to), but I don't have a photo of that. This gives the idea, anyway.
