Bob,
To my eye, it looks like you have at least delamination of the gel coat from the underlying FRP substrate for several inches back from the impact area. Is the port side similarly damaged? I would expect you need to grind off the gel coat back from the impact area until you get to a crack free interface between the gel coat/FRP substrate. Then, build it back up with epoxy, fiberglass cloth, and finish it off with paint. A fiberglass expert may be able to tell quite a bit about the extent of the damaged area by tapping with a mallet and careful listening. FRP does not bend and crumple like sheet metal in response to an impact. Instead, it tends to fail by brittle fracture of the bonds between the strands of fiberglass and the polymer matrix and delamination between layers, much of which is hidden. I guarantee you have a much bigger problem than your initial assessment.
Roger Pihlaja
S/V Dynamic Equilibrium
Sent from my iPhone
