Sorry to hear about the damage, Mark.
Could have been worse, but who needs to hear that...
I used a gel coat repair kit from Mini-craft of Florida when I did some patch work on my hull. I believe they supplied S2 with the original product and were referenced in the S2 Letter to Owners. It's a pretty good match, allowing for 25 years of sun and weather. (I can still see a slight difference 2 years after the fact, but hey, there's bigger things to fix before I get that picky.)
Did it penetrate the hull completely?
I used Balsa and biaxial glass from Jamestown Dist. and West System resin for the structural stuff.
Bob